21331211122021 has 8 divisors (see below), whose sum is σ = 22474758533760. Its totient is φ = 20205672331152.

The previous prime is 21331211121977. The next prime is 21331211122049. The reversal of 21331211122021 is 12022111213312.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21331211122021 - 2²¹ = 21331209024869 is a prime.

It is a super-2 number, since 2×21331211122021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21331211121983 and 21331211122001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331211162021) 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, 4502152786 + ... + 4502157523.

It is an arithmetic number, because the mean of its divisors is an integer number (2809344816720).

Almost surely, 2^{21331211122021} is an apocalyptic number.

It is an amenable number.

21331211122021 is a deficient number, since it is larger than the sum of its proper divisors (1143547411739).

21331211122021 is a wasteful number, since it uses less digits than its factorization.

21331211122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9004310435.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 21331211122021 its reverse (12022111213312), we get a palindrome (33353322335333).

The spelling of 21331211122021 in words is "twenty-one trillion, three hundred thirty-one billion, two hundred eleven million, one hundred twenty-two thousand, twenty-one".