20210222112121 has 4 divisors (see below), whose sum is σ = 20217345915492. Its totient is φ = 20203098308752.

The previous prime is 20210222112029. The next prime is 20210222112133. The reversal of 20210222112121 is 12121122201202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6822021610000 + 13388200502121 = 2611900^2 + 3658989^2 .

It is a cyclic number.

It is not a de Polignac number, because 20210222112121 - 2²⁹ = 20209685241209 is a prime.

It is a super-2 number, since 2×20210222112121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20210222112151) 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, 3561897430 + ... + 3561903103.

It is an arithmetic number, because the mean of its divisors is an integer number (5054336478873).

Almost surely, 2^{20210222112121} is an apocalyptic number.

It is an amenable number.

20210222112121 is a deficient number, since it is larger than the sum of its proper divisors (7123803371).

20210222112121 is an equidigital number, since it uses as much as digits as its factorization.

20210222112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7123803370.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 20210222112121 its reverse (12121122201202), we get a palindrome (32331344313323).

The spelling of 20210222112121 in words is "twenty trillion, two hundred ten billion, two hundred twenty-two million, one hundred twelve thousand, one hundred twenty-one".