21756705230 has 32 divisors (see below), whose sum is σ = 44655395904. Its totient is φ = 7560700416.

The previous prime is 21756705221. The next prime is 21756705251. The reversal of 21756705230 is 3250765712.

It is a congruent number.

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, 4920122 + ... + 4924541.

It is an arithmetic number, because the mean of its divisors is an integer number (1395481122).

Almost surely, 2^21756705230 is an apocalyptic number.

21756705230 is an abundant number, since it is smaller than the sum of its proper divisors (22898690674).

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

21756705230 is a wasteful number, since it uses less digits than its factorization.

21756705230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9844700.

The product of its (nonzero) digits is 88200, while the sum is 38.

The spelling of 21756705230 in words is "twenty-one billion, seven hundred fifty-six million, seven hundred five thousand, two hundred thirty".