21747046830 has 64 divisors (see below), whose sum is σ = 52713460800. Its totient is φ = 5741660160.

The previous prime is 21747046801. The next prime is 21747046859. The reversal of 21747046830 is 3864074712.

It is an interprime number because it is at equal distance from previous prime (21747046801) and next prime (21747046859).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1234726 + ... + 1252214.

It is an arithmetic number, because the mean of its divisors is an integer number (823647825).

Almost surely, 2^21747046830 is an apocalyptic number.

21747046830 is an abundant number, since it is smaller than the sum of its proper divisors (30966413970).

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

21747046830 is a wasteful number, since it uses less digits than its factorization.

21747046830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17909.

The product of its (nonzero) digits is 225792, while the sum is 42.

The spelling of 21747046830 in words is "twenty-one billion, seven hundred forty-seven million, forty-six thousand, eight hundred thirty".