221656356234452 has 12 divisors (see below), whose sum is σ = 387904598797716. Its totient is φ = 110826470863680.

The previous prime is 221656356234431. The next prime is 221656356234493. The reversal of 221656356234452 is 254432653656122.

It can be written as a sum of positive squares in 2 ways, for example, as 2070962759056 + 219585393475396 = 1439084^2 + 14818414^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 426521243 + ... + 427040610.

It is an arithmetic number, because the mean of its divisors is an integer number (32325383233143).

Almost surely, 2^{221656356234452} is an apocalyptic number.

It is an amenable number.

221656356234452 is a deficient number, since it is larger than the sum of its proper divisors (166248242563264).

221656356234452 is a wasteful number, since it uses less digits than its factorization.

221656356234452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853626778 (or 853626776 counting only the distinct ones).

The product of its digits is 62208000, while the sum is 56.

The spelling of 221656356234452 in words is "two hundred twenty-one trillion, six hundred fifty-six billion, three hundred fifty-six million, two hundred thirty-four thousand, four hundred fifty-two".