221255637132 has 24 divisors (see below), whose sum is σ = 518271966576. Its totient is φ = 73464905728.

The previous prime is 221255637121. The next prime is 221255637149. The reversal of 221255637132 is 231736552122.

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, 35868453 + ... + 35874620.

It is an arithmetic number, because the mean of its divisors is an integer number (21594665274).

Almost surely, 2^221255637132 is an apocalyptic number.

It is an amenable number.

221255637132 is an abundant number, since it is smaller than the sum of its proper divisors (297016329444).

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

221255637132 is a wasteful number, since it uses less digits than its factorization.

221255637132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71743337 (or 71743335 counting only the distinct ones).

The product of its digits is 151200, while the sum is 39.

The spelling of 221255637132 in words is "two hundred twenty-one billion, two hundred fifty-five million, six hundred thirty-seven thousand, one hundred thirty-two".