21213211156 has 12 divisors (see below), whose sum is σ = 37986448192. Its totient is φ = 10359940248.

The previous prime is 21213211141. The next prime is 21213211157. The reversal of 21213211156 is 65111231212.

It is a self number, because there is not a number n which added to its sum of digits gives 21213211156.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213211157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61666140 + ... + 61666483.

Almost surely, 2^21213211156 is an apocalyptic number.

It is an amenable number.

21213211156 is a deficient number, since it is larger than the sum of its proper divisors (16773237036).

21213211156 is a wasteful number, since it uses less digits than its factorization.

21213211156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123332670 (or 123332668 counting only the distinct ones).

The product of its digits is 720, while the sum is 25.

Adding to 21213211156 its reverse (65111231212), we get a palindrome (86324442368).

The spelling of 21213211156 in words is "twenty-one billion, two hundred thirteen million, two hundred eleven thousand, one hundred fifty-six".