221771231131264 has 64 divisors (see below), whose sum is σ = 442223496462240. Its totient is φ = 110781844304896.

The previous prime is 221771231131259. The next prime is 221771231131271. The reversal of 221771231131264 is 462131132177122.

221771231131264 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 221771231131264.

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, 726615939 + ... + 726921085.

Almost surely, 2^{221771231131264} is an apocalyptic number.

It is an amenable number.

221771231131264 is a deficient number, since it is larger than the sum of its proper divisors (220452265330976).

221771231131264 is a wasteful number, since it uses less digits than its factorization.

221771231131264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310457 (or 310445 counting only the distinct ones).

The product of its digits is 169344, while the sum is 43.

The spelling of 221771231131264 in words is "two hundred twenty-one trillion, seven hundred seventy-one billion, two hundred thirty-one million, one hundred thirty-one thousand, two hundred sixty-four".