21421211202 has 24 divisors (see below), whose sum is σ = 46419609600. Its totient is φ = 7139329080.

The previous prime is 21421211179. The next prime is 21421211237. The reversal of 21421211202 is 20211212412.

21421211202 is a `hidden beast` number, since 21 + 421 + 21 + 1 + 202 = 666.

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 11 ways as a sum of consecutive naturals, for example, 38299 + ... + 210497.

It is an arithmetic number, because the mean of its divisors is an integer number (1934150400).

Almost surely, 2^21421211202 is an apocalyptic number.

21421211202 is an abundant number, since it is smaller than the sum of its proper divisors (24998398398).

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

21421211202 is a wasteful number, since it uses less digits than its factorization.

21421211202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179118 (or 179115 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21421211202 its reverse (20211212412), we get a palindrome (41632423614).

The spelling of 21421211202 in words is "twenty-one billion, four hundred twenty-one million, two hundred eleven thousand, two hundred two".