21154190255088 has 160 divisors (see below), whose sum is σ = 59727959165952. Its totient is φ = 6398367052800.

The previous prime is 21154190255059. The next prime is 21154190255111. The reversal of 21154190255088 is 88055209145112.

It is a self number, because there is not a number n which added to its sum of digits gives 21154190255088.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1220871481 + ... + 1220888807.

Almost surely, 2^{21154190255088} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21154190255088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29863979582976).

21154190255088 is an abundant number, since it is smaller than the sum of its proper divisors (38573768910864).

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

21154190255088 is a wasteful number, since it uses less digits than its factorization.

21154190255088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21543 (or 21537 counting only the distinct ones).

The product of its (nonzero) digits is 1152000, while the sum is 51.

The spelling of 21154190255088 in words is "twenty-one trillion, one hundred fifty-four billion, one hundred ninety million, two hundred fifty-five thousand, eighty-eight".