221273147238 has 32 divisors (see below), whose sum is σ = 519914529792. Its totient is φ = 61894586400.

The previous prime is 221273147233. The next prime is 221273147257. The reversal of 221273147238 is 832741372122.

It is a self number, because there is not a number n which added to its sum of digits gives 221273147238.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221273147233) 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, 128946198 + ... + 128947913.

It is an arithmetic number, because the mean of its divisors is an integer number (16247329056).

Almost surely, 2^221273147238 is an apocalyptic number.

221273147238 is an abundant number, since it is smaller than the sum of its proper divisors (298641382554).

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

221273147238 is a wasteful number, since it uses less digits than its factorization.

221273147238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257894140.

The product of its digits is 225792, while the sum is 42.

It can be divided in two parts, 221273 and 147238, that added together give a triangular number (368511 = T₈₅₈).

The spelling of 221273147238 in words is "two hundred twenty-one billion, two hundred seventy-three million, one hundred forty-seven thousand, two hundred thirty-eight".