22201662121 has 4 divisors (see below), whose sum is σ = 22204697092. Its totient is φ = 22198627152.

The previous prime is 22201662107. The next prime is 22201662139. The reversal of 22201662121 is 12126610222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12126610222 = 2 ⋅6063305111.

It can be written as a sum of positive squares in 2 ways, for example, as 573842025 + 21627820096 = 23955^2 + 147064^2 .

It is a cyclic number.

It is not a de Polignac number, because 22201662121 - 2⁹ = 22201661609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22301662121) 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, 1506486 + ... + 1521151.

It is an arithmetic number, because the mean of its divisors is an integer number (5551174273).

Almost surely, 2^22201662121 is an apocalyptic number.

It is an amenable number.

22201662121 is a deficient number, since it is larger than the sum of its proper divisors (3034971).

22201662121 is an equidigital number, since it uses as much as digits as its factorization.

22201662121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3034970.

The product of its (nonzero) digits is 1152, while the sum is 25.

The spelling of 22201662121 in words is "twenty-two billion, two hundred one million, six hundred sixty-two thousand, one hundred twenty-one".