22002021121 has 4 divisors (see below), whose sum is σ = 22020160852. Its totient is φ = 21983881392.

The previous prime is 22002021113. The next prime is 22002021143. The reversal of 22002021121 is 12112020022.

It is a happy number.

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 4692935025 + 17309086096 = 68505^2 + 131564^2 .

It is a cyclic number.

It is not a de Polignac number, because 22002021121 - 2³ = 22002021113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22002021161) 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, 9068046 + ... + 9070471.

It is an arithmetic number, because the mean of its divisors is an integer number (5505040213).

Almost surely, 2^22002021121 is an apocalyptic number.

It is an amenable number.

22002021121 is a deficient number, since it is larger than the sum of its proper divisors (18139731).

22002021121 is a wasteful number, since it uses less digits than its factorization.

22002021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18139730.

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

Adding to 22002021121 its reverse (12112020022), we get a palindrome (34114041143).

The spelling of 22002021121 in words is "twenty-two billion, two million, twenty-one thousand, one hundred twenty-one".