21337908722 has 16 divisors (see below), whose sum is σ = 34480104792. Its totient is φ = 9845072640.

The previous prime is 21337908721. The next prime is 21337908727. The reversal of 21337908722 is 22780973312.

It can be written as a sum of positive squares in 4 ways, for example, as 1142372401 + 20195536321 = 33799^2 + 142111^2 .

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (21337908721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50333 + ... + 212624.

Almost surely, 2^21337908722 is an apocalyptic number.

21337908722 is a deficient number, since it is larger than the sum of its proper divisors (13142196070).

21337908722 is a wasteful number, since it uses less digits than its factorization.

21337908722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266093.

The product of its (nonzero) digits is 254016, while the sum is 44.

The spelling of 21337908722 in words is "twenty-one billion, three hundred thirty-seven million, nine hundred eight thousand, seven hundred twenty-two".