21428857006128 has 120 divisors (see below), whose sum is σ = 70455484466640. Its totient is φ = 5994085870080.

The previous prime is 21428857006093. The next prime is 21428857006157. The reversal of 21428857006128 is 82160075882412.

21428857006128 is a `hidden beast` number, since 2 + 1 + 4 + 2 + 8 + 8 + 570 + 0 + 61 + 2 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 520299363 + ... + 520340546.

It is an arithmetic number, because the mean of its divisors is an integer number (587129037222).

Almost surely, 2^{21428857006128} is an apocalyptic number.

It is an amenable number.

21428857006128 is an abundant number, since it is smaller than the sum of its proper divisors (49026627460512).

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

21428857006128 is a wasteful number, since it uses less digits than its factorization.

21428857006128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040639947 (or 1040639938 counting only the distinct ones).

The product of its (nonzero) digits is 3440640, while the sum is 54.

The spelling of 21428857006128 in words is "twenty-one trillion, four hundred twenty-eight billion, eight hundred fifty-seven million, six thousand, one hundred twenty-eight".