21059212473 has 12 divisors (see below), whose sum is σ = 32758775140. Its totient is φ = 12959515296.

The previous prime is 21059212469. The next prime is 21059212501. The reversal of 21059212473 is 37421295012.

21059212473 is a `hidden beast` number, since 2 + 10 + 592 + 12 + 47 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9755907984 + 11303304489 = 98772^2 + 106317^2 .

It is not a de Polignac number, because 21059212473 - 2² = 21059212469 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21059222473) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 89996518 + ... + 89996751.

Almost surely, 2^21059212473 is an apocalyptic number.

It is an amenable number.

21059212473 is a deficient number, since it is larger than the sum of its proper divisors (11699562667).

21059212473 is a wasteful number, since it uses less digits than its factorization.

21059212473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179993288 (or 179993285 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The spelling of 21059212473 in words is "twenty-one billion, fifty-nine million, two hundred twelve thousand, four hundred seventy-three".