20012012121 has 4 divisors (see below), whose sum is σ = 26682682832. Its totient is φ = 13341341412.

The previous prime is 20012012117. The next prime is 20012012123. The reversal of 20012012121 is 12121021002.

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 not a de Polignac number, because 20012012121 - 2² = 20012012117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20012012097 and 20012012106.

It is not an unprimeable number, because it can be changed into a prime (20012012123) 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, 3335335351 + ... + 3335335356.

It is an arithmetic number, because the mean of its divisors is an integer number (6670670708).

Almost surely, 2^20012012121 is an apocalyptic number.

It is an amenable number.

20012012121 is a deficient number, since it is larger than the sum of its proper divisors (6670670711).

20012012121 is an equidigital number, since it uses as much as digits as its factorization.

20012012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6670670710.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20012012121 its reverse (12121021002), we get a palindrome (32133033123).

The spelling of 20012012121 in words is "twenty billion, twelve million, twelve thousand, one hundred twenty-one".