21154534045250 has 64 divisors (see below), whose sum is σ = 39975209164800. Its totient is φ = 8382286696000.

The previous prime is 21154534045223. The next prime is 21154534045273. The reversal of 21154534045250 is 5254043545112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21154534045198 and 21154534045207.

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, 10485416 + ... + 12339084.

It is an arithmetic number, because the mean of its divisors is an integer number (624612643200).

Almost surely, 2^{21154534045250} is an apocalyptic number.

21154534045250 is a deficient number, since it is larger than the sum of its proper divisors (18820675119550).

21154534045250 is a wasteful number, since it uses less digits than its factorization.

21154534045250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1854116 (or 1854106 counting only the distinct ones).

The product of its (nonzero) digits is 480000, while the sum is 41.

The spelling of 21154534045250 in words is "twenty-one trillion, one hundred fifty-four billion, five hundred thirty-four million, forty-five thousand, two hundred fifty".