21514124772 has 48 divisors (see below), whose sum is σ = 63745557120. Its totient is φ = 6146892576.

The previous prime is 21514124761. The next prime is 21514124833. The reversal of 21514124772 is 27742141512.

21514124772 is a `hidden beast` number, since 21 + 514 + 12 + 47 + 72 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 14228163 + ... + 14229674.

It is an arithmetic number, because the mean of its divisors is an integer number (1328032440).

Almost surely, 2^21514124772 is an apocalyptic number.

It is an amenable number.

21514124772 is an abundant number, since it is smaller than the sum of its proper divisors (42231432348).

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

21514124772 is a wasteful number, since it uses less digits than its factorization.

21514124772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28457857 (or 28457849 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

The spelling of 21514124772 in words is "twenty-one billion, five hundred fourteen million, one hundred twenty-four thousand, seven hundred seventy-two".