21131192930 has 8 divisors (see below), whose sum is σ = 38036147292. Its totient is φ = 8452477168.

The previous prime is 21131192921. The next prime is 21131192947. The reversal of 21131192930 is 3929113112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20259821569 + 871371361 = 142337^2 + 29519^2 .

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

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, 1056559637 + ... + 1056559656.

Almost surely, 2^21131192930 is an apocalyptic number.

21131192930 is a deficient number, since it is larger than the sum of its proper divisors (16904954362).

21131192930 is a wasteful number, since it uses less digits than its factorization.

21131192930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2113119300.

The product of its (nonzero) digits is 2916, while the sum is 32.

The spelling of 21131192930 in words is "twenty-one billion, one hundred thirty-one million, one hundred ninety-two thousand, nine hundred thirty".