20020100000121 has 24 divisors (see below), whose sum is σ = 31149153115080. Its totient is φ = 12317381185536.

The previous prime is 20020100000107. The next prime is 20020100000123. The reversal of 20020100000121 is 12100000102002.

It can be written as a sum of positive squares in 4 ways, for example, as 873918346896 + 19146181653225 = 934836^2 + 4375635^2 .

It is not a de Polignac number, because 20020100000121 - 2³⁹ = 19470344186233 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (20020100000123) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18073416 + ... + 19149113.

It is an arithmetic number, because the mean of its divisors is an integer number (1297881379795).

Almost surely, 2^{20020100000121} is an apocalyptic number.

It is an amenable number.

20020100000121 is a deficient number, since it is larger than the sum of its proper divisors (11129053114959).

20020100000121 is a wasteful number, since it uses less digits than its factorization.

20020100000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37227145 (or 37227142 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20020100000121 its reverse (12100000102002), we get a palindrome (32120100102123).

The spelling of 20020100000121 in words is "twenty trillion, twenty billion, one hundred million, one hundred twenty-one", and thus it is an aban number.