120001021 has 4 divisors (see below), whose sum is σ = 137144032. Its totient is φ = 102858012.

The previous prime is 120001019. The next prime is 120001067. The reversal of 120001021 is 120100021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120100021 = 2381 ⋅50441.

It is a cyclic number.

It is not a de Polignac number, because 120001021 - 2¹ = 120001019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (7), and also a Moran number because the ratio is a prime number: 17143003 = 120001021 / (1 + 2 + 0 + 0 + 0 + 1 + 0 + 2 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 120000995 and 120001013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120001001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8571495 + ... + 8571508.

It is an arithmetic number, because the mean of its divisors is an integer number (34286008).

Almost surely, 2^120001021 is an apocalyptic number.

It is an amenable number.

120001021 is a deficient number, since it is larger than the sum of its proper divisors (17143011).

120001021 is an equidigital number, since it uses as much as digits as its factorization.

120001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17143010.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 120001021 is about 10954.4977520651. The cubic root of 120001021 is about 493.2438137524.

Adding to 120001021 its reverse (120100021), we get a palindrome (240101042).

The spelling of 120001021 in words is "one hundred twenty million, one thousand, twenty-one".