21051152515458 has 96 divisors (see below), whose sum is σ = 50279327594496. Its totient is φ = 6324420259584.

The previous prime is 21051152515451. The next prime is 21051152515487. The reversal of 21051152515458 is 85451525115012.

21051152515458 is a `hidden beast` number, since 2 + 1 + 0 + 5 + 1 + 1 + 52 + 51 + 545 + 8 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21051152515451) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28380991 + ... + 29113277.

It is an arithmetic number, because the mean of its divisors is an integer number (523742995776).

Almost surely, 2^{21051152515458} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21051152515458, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25139663797248).

21051152515458 is an abundant number, since it is smaller than the sum of its proper divisors (29228175079038).

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

21051152515458 is a wasteful number, since it uses less digits than its factorization.

21051152515458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735208 (or 735205 counting only the distinct ones).

The product of its (nonzero) digits is 400000, while the sum is 45.

The spelling of 21051152515458 in words is "twenty-one trillion, fifty-one billion, one hundred fifty-two million, five hundred fifteen thousand, four hundred fifty-eight".