21231924680 has 64 divisors (see below), whose sum is σ = 52472534400. Its totient is φ = 7695959040.

The previous prime is 21231924677. The next prime is 21231924683. The reversal of 21231924680 is 8642913212.

It is an interprime number because it is at equal distance from previous prime (21231924677) and next prime (21231924683).

It is a Harshad number since it is a multiple of its sum of digits (38).

It is not an unprimeable number, because it can be changed into a prime (21231924683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 589841 + ... + 624800.

It is an arithmetic number, because the mean of its divisors is an integer number (819883350).

Almost surely, 2^21231924680 is an apocalyptic number.

21231924680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21231924680 is an abundant number, since it is smaller than the sum of its proper divisors (31240609720).

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

21231924680 is a wasteful number, since it uses less digits than its factorization.

21231924680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1214694 (or 1214690 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 38.

The spelling of 21231924680 in words is "twenty-one billion, two hundred thirty-one million, nine hundred twenty-four thousand, six hundred eighty".