21440929028 has 12 divisors (see below), whose sum is σ = 37671116112. Its totient is φ = 10677753000.

The previous prime is 21440928973. The next prime is 21440929079. The reversal of 21440929028 is 82092904412.

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, 10676750 + ... + 10678757.

It is an arithmetic number, because the mean of its divisors is an integer number (3139259676).

Almost surely, 2^21440929028 is an apocalyptic number.

It is an amenable number.

21440929028 is a deficient number, since it is larger than the sum of its proper divisors (16230187084).

21440929028 is a wasteful number, since it uses less digits than its factorization.

21440929028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21355762 (or 21355760 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 41.

The spelling of 21440929028 in words is "twenty-one billion, four hundred forty million, nine hundred twenty-nine thousand, twenty-eight".