21020112202 has 4 divisors (see below), whose sum is σ = 31530168306. Its totient is φ = 10510056100.

The previous prime is 21020112187. The next prime is 21020112209. The reversal of 21020112202 is 20221102012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20263807201 + 756305001 = 142351^2 + 27501^2 .

It is not an unprimeable number, because it can be changed into a prime (21020112209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5255028049 + ... + 5255028052.

Almost surely, 2^21020112202 is an apocalyptic number.

21020112202 is a deficient number, since it is larger than the sum of its proper divisors (10510056104).

21020112202 is a wasteful number, since it uses less digits than its factorization.

21020112202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10510056103.

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

Adding to 21020112202 its reverse (20221102012), we get a palindrome (41241214214).

The spelling of 21020112202 in words is "twenty-one billion, twenty million, one hundred twelve thousand, two hundred two".