21121132332021 has 16 divisors (see below), whose sum is σ = 28180067301120. Its totient is φ = 14071476787200.

The previous prime is 21121132331987. The next prime is 21121132332049. The reversal of 21121132332021 is 12023323112112.

It is not a de Polignac number, because 21121132332021 - 2²² = 21121128137717 is a prime.

It is a super-2 number, since 2×21121132332021² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121132331982 and 21121132332000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121132332071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162126916 + ... + 162257138.

It is an arithmetic number, because the mean of its divisors is an integer number (1761254206320).

Almost surely, 2^{21121132332021} is an apocalyptic number.

It is an amenable number.

21121132332021 is a deficient number, since it is larger than the sum of its proper divisors (7058934969099).

21121132332021 is a wasteful number, since it uses less digits than its factorization.

21121132332021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165436.

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 21121132332021 its reverse (12023323112112), we get a palindrome (33144455444133).

The spelling of 21121132332021 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred thirty-two million, three hundred thirty-two thousand, twenty-one".