20022212121 has 4 divisors (see below), whose sum is σ = 26696282832. Its totient is φ = 13348141412.

The previous prime is 20022212113. The next prime is 20022212123. The reversal of 20022212121 is 12121222002.

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 20022212121 - 2³ = 20022212113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20022212121.

It is not an unprimeable number, because it can be changed into a prime (20022212123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3337035351 + ... + 3337035356.

It is an arithmetic number, because the mean of its divisors is an integer number (6674070708).

Almost surely, 2^20022212121 is an apocalyptic number.

It is an amenable number.

20022212121 is a deficient number, since it is larger than the sum of its proper divisors (6674070711).

20022212121 is an equidigital number, since it uses as much as digits as its factorization.

20022212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6674070710.

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

Adding to 20022212121 its reverse (12121222002), we get a palindrome (32143434123).

The spelling of 20022212121 in words is "twenty billion, twenty-two million, two hundred twelve thousand, one hundred twenty-one".