21625310434 has 24 divisors (see below), whose sum is σ = 40636574748. Its totient is φ = 8555067360.

The previous prime is 21625310423. The next prime is 21625310437. The reversal of 21625310434 is 43401352612.

It can be written as a sum of positive squares in 2 ways, for example, as 21549359209 + 75951225 = 146797^2 + 8715^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21625310396 and 21625310405.

It is not an unprimeable number, because it can be changed into a prime (21625310437) 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, 8485897 + ... + 8488444.

Almost surely, 2^21625310434 is an apocalyptic number.

21625310434 is a deficient number, since it is larger than the sum of its proper divisors (19011264314).

21625310434 is a wasteful number, since it uses less digits than its factorization.

21625310434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16974370 (or 16974363 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The spelling of 21625310434 in words is "twenty-one billion, six hundred twenty-five million, three hundred ten thousand, four hundred thirty-four".