21512762830 has 32 divisors (see below), whose sum is σ = 42671480544. Its totient is φ = 7758446976.

The previous prime is 21512762827. The next prime is 21512762849. The reversal of 21512762830 is 3826721512.

It is a self number, because there is not a number n which added to its sum of digits gives 21512762830.

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, 1918629 + ... + 1929808.

It is an arithmetic number, because the mean of its divisors is an integer number (1333483767).

Almost surely, 2^21512762830 is an apocalyptic number.

21512762830 is a deficient number, since it is larger than the sum of its proper divisors (21158717714).

21512762830 is a wasteful number, since it uses less digits than its factorization.

21512762830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3848500.

The product of its (nonzero) digits is 40320, while the sum is 37.

The spelling of 21512762830 in words is "twenty-one billion, five hundred twelve million, seven hundred sixty-two thousand, eight hundred thirty".