21117753130 has 16 divisors (see below), whose sum is σ = 38208912264. Its totient is φ = 8403333120.

The previous prime is 21117753127. The next prime is 21117753131. The reversal of 21117753130 is 3135771112.

It can be written as a sum of positive squares in 4 ways, for example, as 11172278601 + 9945474529 = 105699^2 + 99727^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21117753092 and 21117753101.

It is not an unprimeable number, because it can be changed into a prime (21117753131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5468991 + ... + 5472850.

Almost surely, 2^21117753130 is an apocalyptic number.

21117753130 is a deficient number, since it is larger than the sum of its proper divisors (17091159134).

21117753130 is a wasteful number, since it uses less digits than its factorization.

21117753130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10942041.

The product of its (nonzero) digits is 4410, while the sum is 31.

The spelling of 21117753130 in words is "twenty-one billion, one hundred seventeen million, seven hundred fifty-three thousand, one hundred thirty".