21234177436 has 6 divisors (see below), whose sum is σ = 37159810520. Its totient is φ = 10617088716.

The previous prime is 21234177383. The next prime is 21234177443. The reversal of 21234177436 is 63477143212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2654272176 + ... + 2654272183.

Almost surely, 2^21234177436 is an apocalyptic number.

It is an amenable number.

21234177436 is a deficient number, since it is larger than the sum of its proper divisors (15925633084).

21234177436 is a wasteful number, since it uses less digits than its factorization.

21234177436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5308544363 (or 5308544361 counting only the distinct ones).

The product of its digits is 169344, while the sum is 40.

The spelling of 21234177436 in words is "twenty-one billion, two hundred thirty-four million, one hundred seventy-seven thousand, four hundred thirty-six".