20202221102021 has 32 divisors (see below), whose sum is σ = 23754433973760. Its totient is φ = 16823241437184.

The previous prime is 20202221101981. The next prime is 20202221102023. The reversal of 20202221102021 is 12020112220202.

It is a happy number.

It is not a de Polignac number, because 20202221102021 - 2²⁶ = 20202153993157 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20202221102023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44337485 + ... + 44790813.

It is an arithmetic number, because the mean of its divisors is an integer number (742326061680).

Almost surely, 2^{20202221102021} is an apocalyptic number.

It is an amenable number.

20202221102021 is a deficient number, since it is larger than the sum of its proper divisors (3552212871739).

20202221102021 is a wasteful number, since it uses less digits than its factorization.

20202221102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454565.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20202221102021 its reverse (12020112220202), we get a palindrome (32222333322223).

The spelling of 20202221102021 in words is "twenty trillion, two hundred two billion, two hundred twenty-one million, one hundred two thousand, twenty-one".