21031122202 has 4 divisors (see below), whose sum is σ = 31546683306. Its totient is φ = 10515561100.

The previous prime is 21031122199. The next prime is 21031122209. The reversal of 21031122202 is 20222113012.

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., 17971815481 + 3059306721 = 134059^2 + 55311^2 .

It is not an unprimeable number, because it can be changed into a prime (21031122209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5257780549 + ... + 5257780552.

Almost surely, 2^21031122202 is an apocalyptic number.

21031122202 is a deficient number, since it is larger than the sum of its proper divisors (10515561104).

21031122202 is a wasteful number, since it uses less digits than its factorization.

21031122202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10515561103.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21031122202 its reverse (20222113012), we get a palindrome (41253235214).

The spelling of 21031122202 in words is "twenty-one billion, thirty-one million, one hundred twenty-two thousand, two hundred two".