21213303112 has 8 divisors (see below), whose sum is σ = 39774943350. Its totient is φ = 10606651552.

The previous prime is 21213303091. The next prime is 21213303113. The reversal of 21213303112 is 21130331212.

It can be written as a sum of positive squares in only one way, i.e., 13311159876 + 7902143236 = 115374^2 + 88894^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 21213303112.

It is not an unprimeable number, because it can be changed into a prime (21213303113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1325831437 + ... + 1325831452.

Almost surely, 2^21213303112 is an apocalyptic number.

It is an amenable number.

21213303112 is a deficient number, since it is larger than the sum of its proper divisors (18561640238).

21213303112 is a wasteful number, since it uses less digits than its factorization.

21213303112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2651662895 (or 2651662891 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21213303112 its reverse (21130331212), we get a palindrome (42343634324).

The spelling of 21213303112 in words is "twenty-one billion, two hundred thirteen million, three hundred three thousand, one hundred twelve".