21051915790230 has 192 divisors, whose sum is σ = 59299140700800. Its totient is φ = 5150922098688.

The previous prime is 21051915790207. The next prime is 21051915790247. The reversal of 21051915790230 is 3209751915012.

21051915790230 is a `hidden beast` number, since 2 + 1 + 0 + 51 + 9 + 1 + 579 + 0 + 23 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1264446946 + ... + 1264463594.

It is an arithmetic number, because the mean of its divisors is an integer number (308849691150).

Almost surely, 2^{21051915790230} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21051915790230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29649570350400).

21051915790230 is an abundant number, since it is smaller than the sum of its proper divisors (38247224910570).

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

21051915790230 is a wasteful number, since it uses less digits than its factorization.

21051915790230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23095 (or 23092 counting only the distinct ones).

The product of its (nonzero) digits is 170100, while the sum is 45.

The spelling of 21051915790230 in words is "twenty-one trillion, fifty-one billion, nine hundred fifteen million, seven hundred ninety thousand, two hundred thirty".