20100121121 has 8 divisors (see below), whose sum is σ = 20639261760. Its totient is φ = 19567595952.

The previous prime is 20100121091. The next prime is 20100121123. The reversal of 20100121121 is 12112100102.

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 20100121121 - 2⁶ = 20100121057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20100121123) 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, 1647710 + ... + 1659863.

It is an arithmetic number, because the mean of its divisors is an integer number (2579907720).

Almost surely, 2^20100121121 is an apocalyptic number.

It is an amenable number.

20100121121 is a deficient number, since it is larger than the sum of its proper divisors (539140639).

20100121121 is a wasteful number, since it uses less digits than its factorization.

20100121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3307735.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20100121121 its reverse (12112100102), we get a palindrome (32212221223).

The spelling of 20100121121 in words is "twenty billion, one hundred million, one hundred twenty-one thousand, one hundred twenty-one".