20200122121 has 4 divisors (see below), whose sum is σ = 20201021200. Its totient is φ = 20199223044.

The previous prime is 20200122119. The next prime is 20200122161. The reversal of 20200122121 is 12122100202.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12122100202 = 2 ⋅6061050101.

It is a cyclic number.

It is not a de Polignac number, because 20200122121 - 2¹ = 20200122119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20200122161) 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, 414951 + ... + 461068.

It is an arithmetic number, because the mean of its divisors is an integer number (5050255300).

Almost surely, 2^20200122121 is an apocalyptic number.

It is an amenable number.

20200122121 is a deficient number, since it is larger than the sum of its proper divisors (899079).

20200122121 is an equidigital number, since it uses as much as digits as its factorization.

20200122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899078.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20200122121 its reverse (12122100202), we get a palindrome (32322222323).

The spelling of 20200122121 in words is "twenty billion, two hundred million, one hundred twenty-two thousand, one hundred twenty-one".