21551215256274 has 48 divisors (see below), whose sum is σ = 47846131603200. Its totient is φ = 6466011156000.

The previous prime is 21551215256261. The next prime is 21551215256341. The reversal of 21551215256274 is 47265251215512.

It is a super-2 number, since 2×21551215256274² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 146881474 + ... + 147028125.

It is an arithmetic number, because the mean of its divisors is an integer number (996794408400).

Almost surely, 2^{21551215256274} is an apocalyptic number.

21551215256274 is an abundant number, since it is smaller than the sum of its proper divisors (26294916346926).

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

21551215256274 is a wasteful number, since it uses less digits than its factorization.

21551215256274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293909727 (or 293909716 counting only the distinct ones).

The product of its digits is 1680000, while the sum is 48.

The spelling of 21551215256274 in words is "twenty-one trillion, five hundred fifty-one billion, two hundred fifteen million, two hundred fifty-six thousand, two hundred seventy-four".