21211222392 has 48 divisors (see below), whose sum is σ = 57463417440. Its totient is φ = 7068394368.

The previous prime is 21211222391. The next prime is 21211222393. The reversal of 21211222392 is 29322211212.

It is an interprime number because it is at equal distance from previous prime (21211222391) and next prime (21211222393).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211222391) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 224353 + ... + 304559.

It is an arithmetic number, because the mean of its divisors is an integer number (1197154530).

Almost surely, 2^21211222392 is an apocalyptic number.

It is an amenable number.

21211222392 is an abundant number, since it is smaller than the sum of its proper divisors (36252195048).

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

21211222392 is a wasteful number, since it uses less digits than its factorization.

21211222392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83892 (or 83885 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The spelling of 21211222392 in words is "twenty-one billion, two hundred eleven million, two hundred twenty-two thousand, three hundred ninety-two".