72212422 has 4 divisors (see below), whose sum is σ = 108318636. Its totient is φ = 36106210.

The previous prime is 72212417. The next prime is 72212431. The reversal of 72212422 is 22421227.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22421227 = 79 ⋅283813.

It is a super-2 number, since 2×72212422² = 10429267782212168, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 72212393 and 72212402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18053104 + ... + 18053107.

It is an arithmetic number, because the mean of its divisors is an integer number (27079659).

Almost surely, 2^72212422 is an apocalyptic number.

72212422 is a deficient number, since it is larger than the sum of its proper divisors (36106214).

72212422 is a wasteful number, since it uses less digits than its factorization.

72212422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36106213.

The product of its digits is 896, while the sum is 22.

The square root of 72212422 is about 8497.7892419146. The cubic root of 72212422 is about 416.4254884441.

Adding to 72212422 its reverse (22421227), we get a palindrome (94633649).

The spelling of 72212422 in words is "seventy-two million, two hundred twelve thousand, four hundred twenty-two".