21647083204 has 24 divisors (see below), whose sum is σ = 38228684760. Its totient is φ = 10724657664.

The previous prime is 21647083201. The next prime is 21647083219. The reversal of 21647083204 is 40238074612.

It can be written as a sum of positive squares in 4 ways, for example, as 1607849604 + 20039233600 = 40098^2 + 141560^2 .

It is a super-2 number, since 2×21647083204² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21647083201) 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, 3083202 + ... + 3090214.

It is an arithmetic number, because the mean of its divisors is an integer number (1592861865).

Almost surely, 2^21647083204 is an apocalyptic number.

It is an amenable number.

21647083204 is a deficient number, since it is larger than the sum of its proper divisors (16581601556).

21647083204 is a wasteful number, since it uses less digits than its factorization.

21647083204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13959 (or 13957 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 37.

The spelling of 21647083204 in words is "twenty-one billion, six hundred forty-seven million, eighty-three thousand, two hundred four".