20100222122021 has 4 divisors (see below), whose sum is σ = 20100231332844. Its totient is φ = 20100212911200.

The previous prime is 20100222121957. The next prime is 20100222122023. The reversal of 20100222122021 is 12022122200102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1971693388900 + 18128528733121 = 1404170^2 + 4257761^2 .

It is a cyclic number.

It is not a de Polignac number, because 20100222122021 - 2⁶ = 20100222121957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100222122023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 722651 + ... + 6381431.

It is an arithmetic number, because the mean of its divisors is an integer number (5025057833211).

Almost surely, 2^{20100222122021} is an apocalyptic number.

It is an amenable number.

20100222122021 is a deficient number, since it is larger than the sum of its proper divisors (9210823).

20100222122021 is an equidigital number, since it uses as much as digits as its factorization.

20100222122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9210822.

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

Adding to 20100222122021 its reverse (12022122200102), we get a palindrome (32122344322123).

The spelling of 20100222122021 in words is "twenty trillion, one hundred billion, two hundred twenty-two million, one hundred twenty-two thousand, twenty-one".