221002201956 has 96 divisors (see below), whose sum is σ = 536034723840. Its totient is φ = 70819330176.

The previous prime is 221002201943. The next prime is 221002201957. The reversal of 221002201956 is 659102200122.

It is a super-2 number, since 2×221002201956² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221002201957) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11511141 + ... + 11530323.

It is an arithmetic number, because the mean of its divisors is an integer number (5583695040).

Almost surely, 2^221002201956 is an apocalyptic number.

It is an amenable number.

221002201956 is an abundant number, since it is smaller than the sum of its proper divisors (315032521884).

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

221002201956 is a wasteful number, since it uses less digits than its factorization.

221002201956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19585 (or 19583 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The spelling of 221002201956 in words is "two hundred twenty-one billion, two million, two hundred one thousand, nine hundred fifty-six".