221637512046450 has 48 divisors (see below), whose sum is σ = 549665190247680. Its totient is φ = 59102889193920.

The previous prime is 221637512046409. The next prime is 221637512046581. The reversal of 221637512046450 is 54640215736122.

It is a happy number.

It is a super-2 number, since 2×221637512046450² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221637512046450.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14532511 + ... + 25582589.

It is an arithmetic number, because the mean of its divisors is an integer number (11451358130160).

Almost surely, 2^{221637512046450} is an apocalyptic number.

221637512046450 is an abundant number, since it is smaller than the sum of its proper divisors (328027678201230).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221637512046450 is a wasteful number, since it uses less digits than its factorization.

221637512046450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11183811 (or 11183806 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 48.

The spelling of 221637512046450 in words is "two hundred twenty-one trillion, six hundred thirty-seven billion, five hundred twelve million, forty-six thousand, four hundred fifty".