21211313202 has 48 divisors (see below), whose sum is σ = 49143114072. Its totient is φ = 6588633600.

The previous prime is 21211313177. The next prime is 21211313209. The reversal of 21211313202 is 20231311212.

21211313202 is a `hidden beast` number, since 212 + 1 + 131 + 320 + 2 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 21211300881 + 12321 = 145641^2 + 111^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21211313209) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 312253 + ... + 374064.

Almost surely, 2^21211313202 is an apocalyptic number.

21211313202 is an abundant number, since it is smaller than the sum of its proper divisors (27931800870).

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

21211313202 is a wasteful number, since it uses less digits than its factorization.

21211313202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686443 (or 686440 counting only the distinct ones).

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

Adding to 21211313202 its reverse (20231311212), we get a palindrome (41442624414).

The spelling of 21211313202 in words is "twenty-one billion, two hundred eleven million, three hundred thirteen thousand, two hundred two".