221995952864 has 36 divisors (see below), whose sum is σ = 499506760872. Its totient is φ = 95138100480.

The previous prime is 221995952863. The next prime is 221995952869. The reversal of 221995952864 is 468259599122.

It is a junction number, because it is equal to n+sod(n) for n = 221995952797 and 221995952806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221995952863) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7036004 + ... + 7067484.

It is an arithmetic number, because the mean of its divisors is an integer number (13875187802).

Almost surely, 2^221995952864 is an apocalyptic number.

It is an amenable number.

221995952864 is an abundant number, since it is smaller than the sum of its proper divisors (277510808008).

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

221995952864 is an frugal number, since it uses more digits than its factorization.

221995952864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62979 (or 31490 counting only the distinct ones).

The product of its digits is 27993600, while the sum is 62.

The spelling of 221995952864 in words is "two hundred twenty-one billion, nine hundred ninety-five million, nine hundred fifty-two thousand, eight hundred sixty-four".