21311022202 has 4 divisors (see below), whose sum is σ = 31966533306. Its totient is φ = 10655511100.

The previous prime is 21311022167. The next prime is 21311022211. The reversal of 21311022202 is 20222011312.

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., 20050843201 + 1260179001 = 141601^2 + 35499^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5327755549 + ... + 5327755552.

Almost surely, 2^21311022202 is an apocalyptic number.

21311022202 is a deficient number, since it is larger than the sum of its proper divisors (10655511104).

21311022202 is a wasteful number, since it uses less digits than its factorization.

21311022202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10655511103.

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

Adding to 21311022202 its reverse (20222011312), we get a palindrome (41533033514).

The spelling of 21311022202 in words is "twenty-one billion, three hundred eleven million, twenty-two thousand, two hundred two".