21023311230021 has 8 divisors (see below), whose sum is σ = 28032000301984. Its totient is φ = 14015081489040.

The previous prime is 21023311230011. The next prime is 21023311230059. The reversal of 21023311230021 is 12003211332012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21023311230021 - 2⁵ = 21023311229989 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 21023311230021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023311230011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114725935 + ... + 114909036.

It is an arithmetic number, because the mean of its divisors is an integer number (3504000037748).

Almost surely, 2^{21023311230021} is an apocalyptic number.

It is an amenable number.

21023311230021 is a deficient number, since it is larger than the sum of its proper divisors (7008689071963).

21023311230021 is a wasteful number, since it uses less digits than its factorization.

21023311230021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229665491.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21023311230021 its reverse (12003211332012), we get a palindrome (33026522562033).

The spelling of 21023311230021 in words is "twenty-one trillion, twenty-three billion, three hundred eleven million, two hundred thirty thousand, twenty-one".