21041555306 has 16 divisors (see below), whose sum is σ = 32338820808. Its totient is φ = 10262054400.

The previous prime is 21041555239. The next prime is 21041555323. The reversal of 21041555306 is 60355514012.

It can be written as a sum of positive squares in 4 ways, for example, as 19518604681 + 1522950625 = 139709^2 + 39025^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 418436 + ... + 466016.

Almost surely, 2^21041555306 is an apocalyptic number.

21041555306 is a deficient number, since it is larger than the sum of its proper divisors (11297265502).

21041555306 is a wasteful number, since it uses less digits than its factorization.

21041555306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53017.

The product of its (nonzero) digits is 18000, while the sum is 32.

The spelling of 21041555306 in words is "twenty-one billion, forty-one million, five hundred fifty-five thousand, three hundred six".