21617373476 has 12 divisors (see below), whose sum is σ = 37832061708. Its totient is φ = 10808212992.

The previous prime is 21617373473. The next prime is 21617373487. The reversal of 21617373476 is 67437371612.

It can be written as a sum of positive squares in 2 ways, for example, as 7408733476 + 14208640000 = 86074^2 + 119200^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21617373476.

It is not an unprimeable number, because it can be changed into a prime (21617373473) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3341 + ... + 207956.

It is an arithmetic number, because the mean of its divisors is an integer number (3152671809).

Almost surely, 2^21617373476 is an apocalyptic number.

It is an amenable number.

21617373476 is a deficient number, since it is larger than the sum of its proper divisors (16214688232).

21617373476 is a wasteful number, since it uses less digits than its factorization.

21617373476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236878 (or 236876 counting only the distinct ones).

The product of its digits is 889056, while the sum is 47.

The spelling of 21617373476 in words is "twenty-one billion, six hundred seventeen million, three hundred seventy-three thousand, four hundred seventy-six".