21306374434 has 8 divisors (see below), whose sum is σ = 31960339308. Its totient is φ = 10652928000.

The previous prime is 21306374423. The next prime is 21306374449. The reversal of 21306374434 is 43447360312.

It can be written as a sum of positive squares in 2 ways, for example, as 20939537025 + 366837409 = 144705^2 + 19153^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21306374393 and 21306374402.

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, 1567 + ... + 206434.

Almost surely, 2^21306374434 is an apocalyptic number.

21306374434 is a deficient number, since it is larger than the sum of its proper divisors (10653964874).

21306374434 is a wasteful number, since it uses less digits than its factorization.

21306374434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259220.

The product of its (nonzero) digits is 145152, while the sum is 37.

The spelling of 21306374434 in words is "twenty-one billion, three hundred six million, three hundred seventy-four thousand, four hundred thirty-four".