21221134134021 has 24 divisors (see below), whose sum is σ = 32010292117440. Its totient is φ = 13521818942016.

The previous prime is 21221134134017. The next prime is 21221134134049. The reversal of 21221134134021 is 12043143112212.

21221134134021 is a `hidden beast` number, since 2 + 1 + 2 + 211 + 3 + 41 + 3 + 402 + 1 = 666.

It is not a de Polignac number, because 21221134134021 - 2² = 21221134134017 is a prime.

It is a super-2 number, since 2×21221134134021² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221134134001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39499491 + ... + 40033136.

It is an arithmetic number, because the mean of its divisors is an integer number (1333762171560).

Almost surely, 2^{21221134134021} is an apocalyptic number.

It is an amenable number.

21221134134021 is a deficient number, since it is larger than the sum of its proper divisors (10789157983419).

21221134134021 is a wasteful number, since it uses less digits than its factorization.

21221134134021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79533945 (or 79533942 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

Adding to 21221134134021 its reverse (12043143112212), we get a palindrome (33264277246233).

The spelling of 21221134134021 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred thirty-four million, one hundred thirty-four thousand, twenty-one".