21270767826 has 64 divisors (see below), whose sum is σ = 54039591936. Its totient is φ = 5420625600.

The previous prime is 21270767743. The next prime is 21270767867. The reversal of 21270767826 is 62876707212.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 409860 + ... + 458831.

It is an arithmetic number, because the mean of its divisors is an integer number (844368624).

Almost surely, 2^21270767826 is an apocalyptic number.

21270767826 is an abundant number, since it is smaller than the sum of its proper divisors (32768824110).

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

21270767826 is a wasteful number, since it uses less digits than its factorization.

21270767826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868767.

The product of its (nonzero) digits is 790272, while the sum is 48.

The spelling of 21270767826 in words is "twenty-one billion, two hundred seventy million, seven hundred sixty-seven thousand, eight hundred twenty-six".