20211220202 has 12 divisors (see below), whose sum is σ = 32205076710. Its totient is φ = 9511162176.

The previous prime is 20211220193. The next prime is 20211220213. The reversal of 20211220202 is 20202211202.

It can be written as a sum of positive squares in 3 ways, for example, as 16517133361 + 3694086841 = 128519^2 + 60779^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17483177 + ... + 17484332.

Almost surely, 2^20211220202 is an apocalyptic number.

20211220202 is a deficient number, since it is larger than the sum of its proper divisors (11993856508).

20211220202 is a wasteful number, since it uses less digits than its factorization.

20211220202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34967545 (or 34967528 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 20211220202 its reverse (20202211202), we get a palindrome (40413431404).

The spelling of 20211220202 in words is "twenty billion, two hundred eleven million, two hundred twenty thousand, two hundred two".