20100102121 has 8 divisors (see below), whose sum is σ = 22634719488. Its totient is φ = 17683374000.

The previous prime is 20100102097. The next prime is 20100102149. The reversal of 20100102121 is 12120100102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20100102121 - 2⁷ = 20100101993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20100102098 and 20100102107.

It is not an unprimeable number, because it can be changed into a prime (20100102161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29471950 + ... + 29472631.

It is an arithmetic number, because the mean of its divisors is an integer number (2829339936).

Almost surely, 2^20100102121 is an apocalyptic number.

It is an amenable number.

20100102121 is a deficient number, since it is larger than the sum of its proper divisors (2534617367).

20100102121 is a wasteful number, since it uses less digits than its factorization.

20100102121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58944623.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20100102121 its reverse (12120100102), we get a palindrome (32220202223).

It can be divided in two parts, 20100102 and 121, that multiplied together give a palindrome (2432112342).

The spelling of 20100102121 in words is "twenty billion, one hundred million, one hundred two thousand, one hundred twenty-one".