72222022222121 has 4 divisors (see below), whose sum is σ = 72225157017600. Its totient is φ = 72218887426644.

The previous prime is 72222022222117. The next prime is 72222022222331. The reversal of 72222022222121 is 12122222022227.

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 72222022222121 - 2² = 72222022222117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72222022222111) 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, 1567363181 + ... + 1567409258.

It is an arithmetic number, because the mean of its divisors is an integer number (18056289254400).

Almost surely, 2^{72222022222121} is an apocalyptic number.

It is an amenable number.

72222022222121 is a deficient number, since it is larger than the sum of its proper divisors (3134795479).

72222022222121 is a wasteful number, since it uses less digits than its factorization.

72222022222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3134795478.

The product of its (nonzero) digits is 7168, while the sum is 29.

Adding to 72222022222121 its reverse (12122222022227), we get a palindrome (84344244244348).

The spelling of 72222022222121 in words is "seventy-two trillion, two hundred twenty-two billion, twenty-two million, two hundred twenty-two thousand, one hundred twenty-one".