21121322503604 has 24 divisors (see below), whose sum is σ = 37043246368128. Its totient is φ = 10537554012480.

The previous prime is 21121322503601. The next prime is 21121322503627. The reversal of 21121322503604 is 40630522312112.

It is a super-2 number, since 2×21121322503604² (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 (21121322503601) 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, 3201752 + ... + 7245264.

It is an arithmetic number, because the mean of its divisors is an integer number (1543468598672).

Almost surely, 2^{21121322503604} is an apocalyptic number.

It is an amenable number.

21121322503604 is a deficient number, since it is larger than the sum of its proper divisors (15921923864524).

21121322503604 is a wasteful number, since it uses less digits than its factorization.

21121322503604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4046375 (or 4046373 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

Adding to 21121322503604 its reverse (40630522312112), we get a palindrome (61751844815716).

The spelling of 21121322503604 in words is "twenty-one trillion, one hundred twenty-one billion, three hundred twenty-two million, five hundred three thousand, six hundred four".