21161674234 has 4 divisors (see below), whose sum is σ = 31742511354. Its totient is φ = 10580837116.

The previous prime is 21161674229. The next prime is 21161674249. The reversal of 21161674234 is 43247616112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19084593609 + 2077080625 = 138147^2 + 45575^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21161674193 and 21161674202.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5290418557 + ... + 5290418560.

Almost surely, 2^21161674234 is an apocalyptic number.

21161674234 is a deficient number, since it is larger than the sum of its proper divisors (10580837120).

21161674234 is a wasteful number, since it uses less digits than its factorization.

21161674234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10580837119.

The product of its digits is 48384, while the sum is 37.

The spelling of 21161674234 in words is "twenty-one billion, one hundred sixty-one million, six hundred seventy-four thousand, two hundred thirty-four".