222155272506721 has 4 divisors (see below), whose sum is σ = 222211786189744. Its totient is φ = 222098758823700.

The previous prime is 222155272506697. The next prime is 222155272506733. The reversal of 222155272506721 is 127605272551222.

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 222155272506721 - 2¹⁷ = 222155272375649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222155272506821) 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, 28256835615 + ... + 28256843476.

It is an arithmetic number, because the mean of its divisors is an integer number (55552946547436).

Almost surely, 2^{222155272506721} is an apocalyptic number.

It is an amenable number.

222155272506721 is a deficient number, since it is larger than the sum of its proper divisors (56513683023).

222155272506721 is an equidigital number, since it uses as much as digits as its factorization.

222155272506721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56513683022.

The product of its (nonzero) digits is 2352000, while the sum is 49.

The spelling of 222155272506721 in words is "two hundred twenty-two trillion, one hundred fifty-five billion, two hundred seventy-two million, five hundred six thousand, seven hundred twenty-one".