221031300312 has 64 divisors (see below), whose sum is σ = 617092581600. Its totient is φ = 73303090560.

The previous prime is 221031300307. The next prime is 221031300317. The reversal of 221031300312 is 213003130122.

221031300312 is a `hidden beast` number, since 2 + 21 + 0 + 31 + 300 + 312 = 666.

It is an interprime number because it is at equal distance from previous prime (221031300307) and next prime (221031300317).

It is a super-2 number, since 2×221031300312² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221031300317) 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, 2554639 + ... + 2639742.

Almost surely, 2^221031300312 is an apocalyptic number.

It is an amenable number.

221031300312 is an abundant number, since it is smaller than the sum of its proper divisors (396061281288).

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

221031300312 is a wasteful number, since it uses less digits than its factorization.

221031300312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5194593 (or 5194583 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 221031300312 its reverse (213003130122), we get a palindrome (434034430434).

The spelling of 221031300312 in words is "two hundred twenty-one billion, thirty-one million, three hundred thousand, three hundred twelve".