221406756222152 has 32 divisors (see below), whose sum is σ = 415322375475000. Its totient is φ = 110654125221888.

The previous prime is 221406756222143. The next prime is 221406756222161. The reversal of 221406756222152 is 251222657604122.

It is an interprime number because it is at equal distance from previous prime (221406756222143) and next prime (221406756222161).

It can be written as a sum of positive squares in 4 ways, for example, as 221371964273476 + 34791948676 = 14878574^2 + 186526^2 .

It is a super-2 number, since 2×221406756222152² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221406756222097 and 221406756222106.

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, 849378974 + ... + 849639602.

Almost surely, 2^{221406756222152} is an apocalyptic number.

It is an amenable number.

221406756222152 is a deficient number, since it is larger than the sum of its proper divisors (193915619252848).

221406756222152 is a wasteful number, since it uses less digits than its factorization.

221406756222152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307473 (or 307469 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 47.

The spelling of 221406756222152 in words is "two hundred twenty-one trillion, four hundred six billion, seven hundred fifty-six million, two hundred twenty-two thousand, one hundred fifty-two".