21002220112 has 40 divisors (see below), whose sum is σ = 41515608456. Its totient is φ = 10289051136.

The previous prime is 21002220103. The next prime is 21002220139. The reversal of 21002220112 is 21102220012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11122655296 + 9879564816 = 105464^2 + 99396^2 .

It is a super-3 number, since 3×21002220112³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21002220092 and 21002220101.

It is a congruent number.

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, 625578 + ... + 658294.

Almost surely, 2^21002220112 is an apocalyptic number.

It is an amenable number.

21002220112 is a deficient number, since it is larger than the sum of its proper divisors (20513388344).

21002220112 is a wasteful number, since it uses less digits than its factorization.

21002220112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33535 (or 33529 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21002220112 its reverse (21102220012), we get a palindrome (42104440124).

The spelling of 21002220112 in words is "twenty-one billion, two million, two hundred twenty thousand, one hundred twelve".