20020102121 has 4 divisors (see below), whose sum is σ = 20710450500. Its totient is φ = 19329753744.

The previous prime is 20020102061. The next prime is 20020102127. The reversal of 20020102121 is 12120102002.

It is a happy number.

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 9932912896 + 10087189225 = 99664^2 + 100435^2 .

It is a cyclic number.

It is not a de Polignac number, because 20020102121 - 2¹⁰ = 20020101097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20020102127) 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, 345174146 + ... + 345174203.

It is an arithmetic number, because the mean of its divisors is an integer number (5177612625).

Almost surely, 2^20020102121 is an apocalyptic number.

It is an amenable number.

20020102121 is a deficient number, since it is larger than the sum of its proper divisors (690348379).

20020102121 is an equidigital number, since it uses as much as digits as its factorization.

20020102121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690348378.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20020102121 its reverse (12120102002), we get a palindrome (32140204123).

The spelling of 20020102121 in words is "twenty billion, twenty million, one hundred two thousand, one hundred twenty-one".