20121030121 has 8 divisors (see below), whose sum is σ = 20464689024. Its totient is φ = 19780223520.

The previous prime is 20121030113. The next prime is 20121030169. The reversal of 20121030121 is 12103012102.

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 20121030121 - 2³ = 20121030113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20121030101) 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, 698845 + ... + 727066.

It is an arithmetic number, because the mean of its divisors is an integer number (2558086128).

Almost surely, 2^20121030121 is an apocalyptic number.

It is an amenable number.

20121030121 is a deficient number, since it is larger than the sum of its proper divisors (343658903).

20121030121 is a wasteful number, since it uses less digits than its factorization.

20121030121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1426151.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 20121030121 its reverse (12103012102), we get a palindrome (32224042223).

The spelling of 20121030121 in words is "twenty billion, one hundred twenty-one million, thirty thousand, one hundred twenty-one".