22000212121 has 4 divisors (see below), whose sum is σ = 22017046032. Its totient is φ = 21983378212.

The previous prime is 22000212097. The next prime is 22000212131. The reversal of 22000212121 is 12121200022.

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 22000212121 - 2⁵ = 22000212089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22000212131) 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, 8414995 + ... + 8417608.

It is an arithmetic number, because the mean of its divisors is an integer number (5504261508).

Almost surely, 2^22000212121 is an apocalyptic number.

It is an amenable number.

22000212121 is a deficient number, since it is larger than the sum of its proper divisors (16833911).

22000212121 is a wasteful number, since it uses less digits than its factorization.

22000212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16833910.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 22000212121 its reverse (12121200022), we get a palindrome (34121412143).

The spelling of 22000212121 in words is "twenty-two billion, two hundred twelve thousand, one hundred twenty-one".