1222263621 has 16 divisors (see below), whose sum is σ = 1825024000. Its totient is φ = 808424064.

The previous prime is 1222263613. The next prime is 1222263659. The reversal of 1222263621 is 1263622221.

It is a happy number.

1222263621 is a `hidden beast` number, since 1 + 2 + 2 + 2 + 2 + 636 + 21 = 666.

It is not a de Polignac number, because 1222263621 - 2³ = 1222263613 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222262621) 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 15 ways as a sum of consecutive naturals, for example, 174796 + ... + 181653.

It is an arithmetic number, because the mean of its divisors is an integer number (114064000).

Almost surely, 2^1222263621 is an apocalyptic number.

It is an amenable number.

1222263621 is a deficient number, since it is larger than the sum of its proper divisors (602760379).

1222263621 is a wasteful number, since it uses less digits than its factorization.

1222263621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356585 (or 356579 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 1222263621 is about 34960.8870167792. The cubic root of 1222263621 is about 1069.1901814988.

Adding to 1222263621 its reverse (1263622221), we get a palindrome (2485885842).

The spelling of 1222263621 in words is "one billion, two hundred twenty-two million, two hundred sixty-three thousand, six hundred twenty-one".