72222211 has 4 divisors (see below), whose sum is σ = 76023400. Its totient is φ = 68421024.

The previous prime is 72222193. The next prime is 72222229. The reversal of 72222211 is 11222227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11222227 = 17 ⋅660131.

It is an interprime number because it is at equal distance from previous prime (72222193) and next prime (72222229).

It is a cyclic number.

It is not a de Polignac number, because 72222211 - 2⁵ = 72222179 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 3801169 = 72222211 / (7 + 2 + 2 + 2 + 2 + 2 + 1 + 1).

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (72222251) 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, 1900566 + ... + 1900603.

It is an arithmetic number, because the mean of its divisors is an integer number (19005850).

Almost surely, 2^72222211 is an apocalyptic number.

72222211 is a deficient number, since it is larger than the sum of its proper divisors (3801189).

72222211 is a wasteful number, since it uses less digits than its factorization.

72222211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3801188.

The product of its digits is 224, while the sum is 19.

The square root of 72222211 is about 8498.3651957303. The cubic root of 72222211 is about 416.4443042508. Note that the first 3 decimals are identical.

Adding to 72222211 its reverse (11222227), we get a palindrome (83444438).

The spelling of 72222211 in words is "seventy-two million, two hundred twenty-two thousand, two hundred eleven".