221001221021023 has 4 divisors (see below), whose sum is σ = 221006213525160. Its totient is φ = 220996228516888.

The previous prime is 221001221020969. The next prime is 221001221021029. The reversal of 221001221021023 is 320120122100122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221001221021023 - 2²¹ = 221001218923871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221001221021029) 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, 2496185668 + ... + 2496274201.

It is an arithmetic number, because the mean of its divisors is an integer number (55251553381290).

Almost surely, 2^{221001221021023} is an apocalyptic number.

221001221021023 is a deficient number, since it is larger than the sum of its proper divisors (4992504137).

221001221021023 is an equidigital number, since it uses as much as digits as its factorization.

221001221021023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4992504136.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 221001221021023 its reverse (320120122100122), we get a palindrome (541121343121145).

The spelling of 221001221021023 in words is "two hundred twenty-one trillion, one billion, two hundred twenty-one million, twenty-one thousand, twenty-three".