21507460625450 has 24 divisors (see below), whose sum is σ = 40235113061388. Its totient is φ = 8553256014080.

The previous prime is 21507460625383. The next prime is 21507460625461. The reversal of 21507460625450 is 5452606470512.

It can be written as a sum of positive squares in 6 ways, for example, as 14896334618929 + 6611126006521 = 3859577^2 + 2571211^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21507460625395 and 21507460625404.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1243197167 + ... + 1243214466.

Almost surely, 2^{21507460625450} is an apocalyptic number.

21507460625450 is a deficient number, since it is larger than the sum of its proper divisors (18727652435938).

21507460625450 is a wasteful number, since it uses less digits than its factorization.

21507460625450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2486411818 (or 2486411813 counting only the distinct ones).

The product of its (nonzero) digits is 2016000, while the sum is 47.

The spelling of 21507460625450 in words is "twenty-one trillion, five hundred seven billion, four hundred sixty million, six hundred twenty-five thousand, four hundred fifty".