21632325490 has 8 divisors (see below), whose sum is σ = 38938185900. Its totient is φ = 8652930192.

The previous prime is 21632325487. The next prime is 21632325503. The reversal of 21632325490 is 9452323612.

It can be written as a sum of positive squares in 2 ways, for example, as 20626991641 + 1005333849 = 143621^2 + 31707^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21632325490² (a number of 21 digits) contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1081616265 + ... + 1081616284.

Almost surely, 2^21632325490 is an apocalyptic number.

21632325490 is a deficient number, since it is larger than the sum of its proper divisors (17305860410).

21632325490 is a wasteful number, since it uses less digits than its factorization.

21632325490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2163232556.

The product of its (nonzero) digits is 77760, while the sum is 37.

The spelling of 21632325490 in words is "twenty-one billion, six hundred thirty-two million, three hundred twenty-five thousand, four hundred ninety".