21220331112 has 24 divisors (see below), whose sum is σ = 57471730290. Its totient is φ = 7073443680.

The previous prime is 21220331101. The next prime is 21220331123. The reversal of 21220331112 is 21113302212.

21220331112 is a `hidden beast` number, since 2 + 1 + 220 + 331 + 112 = 666.

It is an interprime number because it is at equal distance from previous prime (21220331101) and next prime (21220331123).

It can be written as a sum of positive squares in only one way, i.e., 20789602596 + 430728516 = 144186^2 + 20754^2 .

It is a tau number, because it is divible by the number of its divisors (24).

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

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 147363339 + ... + 147363482.

Almost surely, 2^21220331112 is an apocalyptic number.

It is an amenable number.

21220331112 is an abundant number, since it is smaller than the sum of its proper divisors (36251399178).

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

21220331112 is a wasteful number, since it uses less digits than its factorization.

21220331112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294726833 (or 294726826 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21220331112 its reverse (21113302212), we get a palindrome (42333633324).

The spelling of 21220331112 in words is "twenty-one billion, two hundred twenty million, three hundred thirty-one thousand, one hundred twelve".