21051891182 has 32 divisors (see below), whose sum is σ = 37149077952. Its totient is φ = 8760720384.

The previous prime is 21051891151. The next prime is 21051891199. The reversal of 21051891182 is 28119815012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74273 + ... + 218220.

It is an arithmetic number, because the mean of its divisors is an integer number (1160908686).

Almost surely, 2^21051891182 is an apocalyptic number.

21051891182 is a deficient number, since it is larger than the sum of its proper divisors (16097186770).

21051891182 is a wasteful number, since it uses less digits than its factorization.

21051891182 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292652.

The product of its (nonzero) digits is 11520, while the sum is 38.

The spelling of 21051891182 in words is "twenty-one billion, fifty-one million, eight hundred ninety-one thousand, one hundred eighty-two".