22122112121201 has 4 divisors (see below), whose sum is σ = 22270582672500. Its totient is φ = 21973641569904.

The previous prime is 22122112121107. The next prime is 22122112121203. The reversal of 22122112121201 is 10212121122122.

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 2098268131600 + 20023843989601 = 1448540^2 + 4474801^2 .

It is a de Polignac number, because none of the positive numbers 2^k-22122112121201 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22122112121203) 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, 74235275426 + ... + 74235275723.

It is an arithmetic number, because the mean of its divisors is an integer number (5567645668125).

Almost surely, 2^{22122112121201} is an apocalyptic number.

It is an amenable number.

22122112121201 is a deficient number, since it is larger than the sum of its proper divisors (148470551299).

22122112121201 is a wasteful number, since it uses less digits than its factorization.

22122112121201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148470551298.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 22122112121201 its reverse (10212121122122), we get a palindrome (32334233243323).

The spelling of 22122112121201 in words is "twenty-two trillion, one hundred twenty-two billion, one hundred twelve million, one hundred twenty-one thousand, two hundred one".