221312679651 has 48 divisors (see below), whose sum is σ = 381461008800. Its totient is φ = 126444338496.

The previous prime is 221312679613. The next prime is 221312679667. The reversal of 221312679651 is 156976213122.

221312679651 is a `hidden beast` number, since 221 + 31 + 267 + 96 + 51 = 666.

It is not a de Polignac number, because 221312679651 - 2⁶ = 221312679587 is a prime.

It is a super-2 number, since 2×221312679651² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 221312679597 and 221312679606.

It is not an unprimeable number, because it can be changed into a prime (221312679451) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13662465 + ... + 13678653.

It is an arithmetic number, because the mean of its divisors is an integer number (7947104350).

Almost surely, 2^221312679651 is an apocalyptic number.

221312679651 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

221312679651 is a deficient number, since it is larger than the sum of its proper divisors (160148329149).

221312679651 is a wasteful number, since it uses less digits than its factorization.

221312679651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26545 (or 26532 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The spelling of 221312679651 in words is "two hundred twenty-one billion, three hundred twelve million, six hundred seventy-nine thousand, six hundred fifty-one".