20202122121 has 4 divisors (see below), whose sum is σ = 26936162832. Its totient is φ = 13468081412.

The previous prime is 20202122117. The next prime is 20202122123. The reversal of 20202122121 is 12122120202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20202122121 - 2² = 20202122117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20202122121.

It is not an unprimeable number, because it can be changed into a prime (20202122123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3367020351 + ... + 3367020356.

It is an arithmetic number, because the mean of its divisors is an integer number (6734040708).

Almost surely, 2^20202122121 is an apocalyptic number.

It is an amenable number.

20202122121 is a deficient number, since it is larger than the sum of its proper divisors (6734040711).

20202122121 is an equidigital number, since it uses as much as digits as its factorization.

20202122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6734040710.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20202122121 its reverse (12122120202), we get a palindrome (32324242323).

The spelling of 20202122121 in words is "twenty billion, two hundred two million, one hundred twenty-two thousand, one hundred twenty-one".