20012222121 has 4 divisors (see below), whose sum is σ = 26682962832. Its totient is φ = 13341481412.

The previous prime is 20012222107. The next prime is 20012222123. The reversal of 20012222121 is 12122221002.

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 20012222121 - 2¹⁴ = 20012205737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20012222121.

It is not an unprimeable number, because it can be changed into a prime (20012222123) 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, 3335370351 + ... + 3335370356.

It is an arithmetic number, because the mean of its divisors is an integer number (6670740708).

Almost surely, 2^20012222121 is an apocalyptic number.

It is an amenable number.

20012222121 is a deficient number, since it is larger than the sum of its proper divisors (6670740711).

20012222121 is an equidigital number, since it uses as much as digits as its factorization.

20012222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6670740710.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20012222121 its reverse (12122221002), we get a palindrome (32134443123).

The spelling of 20012222121 in words is "twenty billion, twelve million, two hundred twenty-two thousand, one hundred twenty-one".