72211212 has 36 divisors (see below), whose sum is σ = 182885976. Its totient is φ = 24024000.

The previous prime is 72211207. The next prime is 72211213. The reversal of 72211212 is 21211227.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (72211213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20587 + ... + 23837.

It is an arithmetic number, because the mean of its divisors is an integer number (5080166).

Almost surely, 2^72211212 is an apocalyptic number.

It is an amenable number.

72211212 is an abundant number, since it is smaller than the sum of its proper divisors (110674764).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72211212 is a wasteful number, since it uses less digits than its factorization.

72211212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3878 (or 3873 counting only the distinct ones).

The product of its digits is 112, while the sum is 18.

The square root of 72211212 is about 8497.7180466288. The cubic root of 72211212 is about 416.4231625393.

Adding to 72211212 its reverse (21211227), we get a palindrome (93422439).

The spelling of 72211212 in words is "seventy-two million, two hundred eleven thousand, two hundred twelve".