21530235247376 has 10 divisors (see below), whose sum is σ = 41714830791822. Its totient is φ = 10765117623680.

The previous prime is 21530235247369. The next prime is 21530235247403. The reversal of 21530235247376 is 67374253203512.

It can be written as a sum of positive squares in only one way, i.e., 14225539848976 + 7304695398400 = 3771676^2 + 2702720^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 672819851465 + ... + 672819851496.

Almost surely, 2^{21530235247376} is an apocalyptic number.

It is an amenable number.

21530235247376 is a deficient number, since it is larger than the sum of its proper divisors (20184595544446).

21530235247376 is a wasteful number, since it uses less digits than its factorization.

21530235247376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1345639702969 (or 1345639702963 counting only the distinct ones).

The product of its (nonzero) digits is 6350400, while the sum is 50.

The spelling of 21530235247376 in words is "twenty-one trillion, five hundred thirty billion, two hundred thirty-five million, two hundred forty-seven thousand, three hundred seventy-six".