21561530034 has 32 divisors (see below), whose sum is σ = 47086147584. Its totient is φ = 6527851280.

The previous prime is 21561530017. The next prime is 21561530051. The reversal of 21561530034 is 43003516512.

It is an interprime number because it is at equal distance from previous prime (21561530017) and next prime (21561530051).

It is a junction number, because it is equal to n+sod(n) for n = 21561529983 and 21561530010.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75294 + ... + 220889.

It is an arithmetic number, because the mean of its divisors is an integer number (1471442112).

Almost surely, 2^21561530034 is an apocalyptic number.

21561530034 is an abundant number, since it is smaller than the sum of its proper divisors (25524617550).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21561530034 is a wasteful number, since it uses less digits than its factorization.

21561530034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297302.

The product of its (nonzero) digits is 10800, while the sum is 30.

The spelling of 21561530034 in words is "twenty-one billion, five hundred sixty-one million, five hundred thirty thousand, thirty-four".