21034055004 has 48 divisors (see below), whose sum is σ = 49320357408. Its totient is φ = 6976995328.

The previous prime is 21034054939. The next prime is 21034055017. The reversal of 21034055004 is 40055043012.

It is a super-2 number, since 2×21034055004² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 3676354 + ... + 3682070.

It is an arithmetic number, because the mean of its divisors is an integer number (1027507446).

Almost surely, 2^21034055004 is an apocalyptic number.

It is an amenable number.

21034055004 is an abundant number, since it is smaller than the sum of its proper divisors (28286302404).

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

21034055004 is a wasteful number, since it uses less digits than its factorization.

21034055004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7174 (or 7172 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

Adding to 21034055004 its reverse (40055043012), we get a palindrome (61089098016).

The spelling of 21034055004 in words is "twenty-one billion, thirty-four million, fifty-five thousand, four".