21234200202 has 24 divisors (see below), whose sum is σ = 47129567940. Its totient is φ = 6905430720.

The previous prime is 21234200201. The next prime is 21234200209. The reversal of 21234200202 is 20200243212.

21234200202 is a `hidden beast` number, since 21 + 23 + 420 + 0 + 202 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19474481601 + 1759718601 = 139551^2 + 41949^2 .

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 (21234200201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14385577 + ... + 14387052.

Almost surely, 2^21234200202 is an apocalyptic number.

21234200202 is an abundant number, since it is smaller than the sum of its proper divisors (25895367738).

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

21234200202 is a wasteful number, since it uses less digits than its factorization.

21234200202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28772678 (or 28772675 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 21234200202 its reverse (20200243212), we get a palindrome (41434443414).

The spelling of 21234200202 in words is "twenty-one billion, two hundred thirty-four million, two hundred thousand, two hundred two".