213120001 has 4 divisors (see below), whose sum is σ = 222386112. Its totient is φ = 203853892.

The previous prime is 213119993. The next prime is 213120029. The reversal of 213120001 is 100021312.

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.

It is a cyclic number.

It is not a de Polignac number, because 213120001 - 2³ = 213119993 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213120001.

It is not an unprimeable number, because it can be changed into a prime (213120601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4633021 + ... + 4633066.

It is an arithmetic number, because the mean of its divisors is an integer number (55596528).

Almost surely, 2^213120001 is an apocalyptic number.

It is an amenable number.

213120001 is a deficient number, since it is larger than the sum of its proper divisors (9266111).

213120001 is an equidigital number, since it uses as much as digits as its factorization.

213120001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9266110.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 213120001 is about 14598.6301069655. The cubic root of 213120001 is about 597.3213938362.

Adding to 213120001 its reverse (100021312), we get a palindrome (313141313).

It can be divided in two parts, 2 and 13120001, that added together give a triangular number (13120003 = T₅₁₂₂).

The spelling of 213120001 in words is "two hundred thirteen million, one hundred twenty thousand, one".