20124100121 has 4 divisors (see below), whose sum is σ = 20552272512. Its totient is φ = 19695927732.

The previous prime is 20124100109. The next prime is 20124100187. The reversal of 20124100121 is 12100142102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20124100121 - 2¹⁸ = 20123837977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20124100096 and 20124100105.

It is not an unprimeable number, because it can be changed into a prime (20124103121) 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, 214086125 + ... + 214086218.

It is an arithmetic number, because the mean of its divisors is an integer number (5138068128).

Almost surely, 2^20124100121 is an apocalyptic number.

It is an amenable number.

20124100121 is a deficient number, since it is larger than the sum of its proper divisors (428172391).

20124100121 is an equidigital number, since it uses as much as digits as its factorization.

20124100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428172390.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20124100121 its reverse (12100142102), we get a palindrome (32224242223).

The spelling of 20124100121 in words is "twenty billion, one hundred twenty-four million, one hundred thousand, one hundred twenty-one".