221251156 has 24 divisors (see below), whose sum is σ = 443226560. Its totient is φ = 94666752.

The previous prime is 221251139. The next prime is 221251159. The reversal of 221251156 is 651152122.

It is a self number, because there is not a number n which added to its sum of digits gives 221251156.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221251159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11860 + ... + 24148.

Almost surely, 2^221251156 is an apocalyptic number.

It is an amenable number.

221251156 is an abundant number, since it is smaller than the sum of its proper divisors (221975404).

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

221251156 is a wasteful number, since it uses less digits than its factorization.

221251156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12943 (or 12941 counting only the distinct ones).

The product of its digits is 1200, while the sum is 25.

The square root of 221251156 is about 14874.5136391077. The cubic root of 221251156 is about 604.8233038166.

The spelling of 221251156 in words is "two hundred twenty-one million, two hundred fifty-one thousand, one hundred fifty-six".