21607057738 has 24 divisors (see below), whose sum is σ = 37737562500. Its totient is φ = 9251460288.

The previous prime is 21607057663. The next prime is 21607057741. The reversal of 21607057738 is 83775070612.

It can be written as a sum of positive squares in 2 ways, for example, as 21095529049 + 511528689 = 145243^2 + 22617^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1638 + ... + 207886.

Almost surely, 2^21607057738 is an apocalyptic number.

21607057738 is a deficient number, since it is larger than the sum of its proper divisors (16130504762).

21607057738 is a wasteful number, since it uses less digits than its factorization.

21607057738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207334 (or 207327 counting only the distinct ones).

The product of its (nonzero) digits is 493920, while the sum is 46.

The spelling of 21607057738 in words is "twenty-one billion, six hundred seven million, fifty-seven thousand, seven hundred thirty-eight".