21222584673646 has 16 divisors (see below), whose sum is σ = 33031306220976. Its totient is φ = 10218062497536.

The previous prime is 21222584673611. The next prime is 21222584673721. The reversal of 21222584673646 is 64637648522212.

It is a congruent number.

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, 1478300476 + ... + 1478314831.

It is an arithmetic number, because the mean of its divisors is an integer number (2064456638811).

Almost surely, 2^{21222584673646} is an apocalyptic number.

21222584673646 is a deficient number, since it is larger than the sum of its proper divisors (11808721547330).

21222584673646 is a wasteful number, since it uses less digits than its factorization.

21222584673646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2956615443.

The product of its digits is 46448640, while the sum is 58.

The spelling of 21222584673646 in words is "twenty-one trillion, two hundred twenty-two billion, five hundred eighty-four million, six hundred seventy-three thousand, six hundred forty-six".