21620101624 has 16 divisors (see below), whose sum is σ = 44222935320. Its totient is φ = 9827318880.

The previous prime is 21620101621. The next prime is 21620101639. The reversal of 21620101624 is 42610102612.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21620101621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122841399 + ... + 122841574.

Almost surely, 2^21620101624 is an apocalyptic number.

It is an amenable number.

21620101624 is an abundant number, since it is smaller than the sum of its proper divisors (22602833696).

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

21620101624 is a wasteful number, since it uses less digits than its factorization.

21620101624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245682990 (or 245682986 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The spelling of 21620101624 in words is "twenty-one billion, six hundred twenty million, one hundred one thousand, six hundred twenty-four".