21051095413128 has 128 divisors (see below), whose sum is σ = 62885441232000. Its totient is φ = 5796847185920.

The previous prime is 21051095413093. The next prime is 21051095413171. The reversal of 21051095413128 is 82131459015012.

It is a self number, because there is not a number n which added to its sum of digits gives 21051095413128.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 80741043 + ... + 81001346.

It is an arithmetic number, because the mean of its divisors is an integer number (491292509625).

Almost surely, 2^{21051095413128} is an apocalyptic number.

It is an amenable number.

21051095413128 is an abundant number, since it is smaller than the sum of its proper divisors (41834345818872).

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

21051095413128 is a wasteful number, since it uses less digits than its factorization.

21051095413128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161742455 (or 161742451 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 42.

The spelling of 21051095413128 in words is "twenty-one trillion, fifty-one billion, ninety-five million, four hundred thirteen thousand, one hundred twenty-eight".