21164501024 has 24 divisors (see below), whose sum is σ = 42453796140. Its totient is φ = 10382584576.

The previous prime is 21164501021. The next prime is 21164501089. The reversal of 21164501024 is 42010546112.

It can be written as a sum of positive squares in 2 ways, for example, as 21063297424 + 101203600 = 145132^2 + 10060^2 .

It is a super-2 number, since 2×21164501024² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21164500984 and 21164501002.

It is not an unprimeable number, because it can be changed into a prime (21164501021) 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, 6237839 + ... + 6241230.

Almost surely, 2^21164501024 is an apocalyptic number.

It is an amenable number.

21164501024 is an abundant number, since it is smaller than the sum of its proper divisors (21289295116).

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

21164501024 is a wasteful number, since it uses less digits than its factorization.

21164501024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12479132 (or 12479124 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The spelling of 21164501024 in words is "twenty-one billion, one hundred sixty-four million, five hundred one thousand, twenty-four".