21121110221004 has 72 divisors (see below), whose sum is σ = 53436452509440. Its totient is φ = 7034176312032.

The previous prime is 21121110220949. The next prime is 21121110221033. The reversal of 21121110221004 is 40012201112112.

It is a super-2 number, since 2×21121110221004² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 479708839 + ... + 479752865.

It is an arithmetic number, because the mean of its divisors is an integer number (742172951520).

Almost surely, 2^{21121110221004} is an apocalyptic number.

It is an amenable number.

21121110221004 is an abundant number, since it is smaller than the sum of its proper divisors (32315342288436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21121110221004 is a wasteful number, since it uses less digits than its factorization.

21121110221004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55459 (or 55454 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21121110221004 its reverse (40012201112112), we get a palindrome (61133311333116).

The spelling of 21121110221004 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred ten million, two hundred twenty-one thousand, four".