21026520080774 has 64 divisors (see below), whose sum is σ = 34848618814464. Its totient is φ = 9455723899776.

The previous prime is 21026520080767. The next prime is 21026520080777. The reversal of 21026520080774 is 47708002562012.

It is a super-2 number, since 2×21026520080774² (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 (21026520080777) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 152981687 + ... + 153119069.

It is an arithmetic number, because the mean of its divisors is an integer number (544509668976).

Almost surely, 2^{21026520080774} is an apocalyptic number.

21026520080774 is a deficient number, since it is larger than the sum of its proper divisors (13822098733690).

21026520080774 is a wasteful number, since it uses less digits than its factorization.

21026520080774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138421.

The product of its (nonzero) digits is 376320, while the sum is 44.

The spelling of 21026520080774 in words is "twenty-one trillion, twenty-six billion, five hundred twenty million, eighty thousand, seven hundred seventy-four".