21071226164 has 48 divisors (see below), whose sum is σ = 41102183808. Its totient is φ = 9400731648.

The previous prime is 21071226097. The next prime is 21071226173. The reversal of 21071226164 is 46162217012.

It is a self number, because there is not a number n which added to its sum of digits gives 21071226164.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117119 + ... + 236345.

It is an arithmetic number, because the mean of its divisors is an integer number (856295496).

Almost surely, 2^21071226164 is an apocalyptic number.

It is an amenable number.

21071226164 is a deficient number, since it is larger than the sum of its proper divisors (20030957644).

21071226164 is a wasteful number, since it uses less digits than its factorization.

21071226164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119384 (or 119382 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The spelling of 21071226164 in words is "twenty-one billion, seventy-one million, two hundred twenty-six thousand, one hundred sixty-four".