221637506463042 has 32 divisors (see below), whose sum is σ = 454095749769984. Its totient is φ = 72075785308800.

The previous prime is 221637506463011. The next prime is 221637506463047. The reversal of 221637506463042 is 240364605736122.

It is not an unprimeable number, because it can be changed into a prime (221637506463047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3186567 + ... + 21293877.

It is an arithmetic number, because the mean of its divisors is an integer number (14190492180312).

Almost surely, 2^{221637506463042} is an apocalyptic number.

221637506463042 is an abundant number, since it is smaller than the sum of its proper divisors (232458243306942).

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

221637506463042 is a wasteful number, since it uses less digits than its factorization.

221637506463042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18157114.

The product of its (nonzero) digits is 8709120, while the sum is 51.

The spelling of 221637506463042 in words is "two hundred twenty-one trillion, six hundred thirty-seven billion, five hundred six million, four hundred sixty-three thousand, forty-two".