21050205122004 has 24 divisors (see below), whose sum is σ = 49274069080320. Its totient is φ = 6994317355584.

The previous prime is 21050205121969. The next prime is 21050205122017. The reversal of 21050205122004 is 40022150205012.

It is a super-2 number, since 2×21050205122004² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2802206724 + ... + 2802214235.

It is an arithmetic number, because the mean of its divisors is an integer number (2053086211680).

Almost surely, 2^{21050205122004} is an apocalyptic number.

It is an amenable number.

21050205122004 is an abundant number, since it is smaller than the sum of its proper divisors (28223863958316).

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

21050205122004 is a wasteful number, since it uses less digits than its factorization.

21050205122004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5604421279 (or 5604421277 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

Adding to 21050205122004 its reverse (40022150205012), we get a palindrome (61072355327016).

The spelling of 21050205122004 in words is "twenty-one trillion, fifty billion, two hundred five million, one hundred twenty-two thousand, four".