20240142121 has 4 divisors (see below), whose sum is σ = 20245220100. Its totient is φ = 20235064144.

The previous prime is 20240142107. The next prime is 20240142187. The reversal of 20240142121 is 12124104202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8772944896 + 11467197225 = 93664^2 + 107085^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20240142121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20240142101) 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, 2533006 + ... + 2540983.

It is an arithmetic number, because the mean of its divisors is an integer number (5061305025).

Almost surely, 2^20240142121 is an apocalyptic number.

It is an amenable number.

20240142121 is a deficient number, since it is larger than the sum of its proper divisors (5077979).

20240142121 is an equidigital number, since it uses as much as digits as its factorization.

20240142121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5077978.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 20240142121 its reverse (12124104202), we get a palindrome (32364246323).

The spelling of 20240142121 in words is "twenty billion, two hundred forty million, one hundred forty-two thousand, one hundred twenty-one".