21250306055456 has 24 divisors (see below), whose sum is σ = 42250763221884. Its totient is φ = 10519953491200.

The previous prime is 21250306055401. The next prime is 21250306055467. The reversal of 21250306055456 is 65455060305212.

It can be written as a sum of positive squares in 2 ways, for example, as 21087235463056 + 163070592400 = 4592084^2 + 403820^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3287482235 + ... + 3287488698.

Almost surely, 2^{21250306055456} is an apocalyptic number.

It is an amenable number.

21250306055456 is a deficient number, since it is larger than the sum of its proper divisors (21000457166428).

21250306055456 is a wasteful number, since it uses less digits than its factorization.

21250306055456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6574971044 (or 6574971036 counting only the distinct ones).

The product of its (nonzero) digits is 1080000, while the sum is 44.

The spelling of 21250306055456 in words is "twenty-one trillion, two hundred fifty billion, three hundred six million, fifty-five thousand, four hundred fifty-six".