21227143764 has 12 divisors (see below), whose sum is σ = 49530002144. Its totient is φ = 7075714584.

The previous prime is 21227143759. The next prime is 21227143771. The reversal of 21227143764 is 46734172212.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 884464312 + ... + 884464335.

Almost surely, 2^21227143764 is an apocalyptic number.

It is an amenable number.

21227143764 is an abundant number, since it is smaller than the sum of its proper divisors (28302858380).

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

21227143764 is a wasteful number, since it uses less digits than its factorization.

21227143764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1768928654 (or 1768928652 counting only the distinct ones).

The product of its digits is 112896, while the sum is 39.

The spelling of 21227143764 in words is "twenty-one billion, two hundred twenty-seven million, one hundred forty-three thousand, seven hundred sixty-four".