21012222320 has 40 divisors (see below), whose sum is σ = 49892860224. Its totient is φ = 8226060032.

The previous prime is 21012222317. The next prime is 21012222323. The reversal of 21012222320 is 2322221012.

It is an interprime number because it is at equal distance from previous prime (21012222317) and next prime (21012222323).

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012222323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2790419 + ... + 2797938.

Almost surely, 2^21012222320 is an apocalyptic number.

21012222320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012222320 is an abundant number, since it is smaller than the sum of its proper divisors (28880637904).

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

21012222320 is a wasteful number, since it uses less digits than its factorization.

21012222320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5588417 (or 5588411 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21012222320 its reverse (2322221012), we get a palindrome (23334443332).

The spelling of 21012222320 in words is "twenty-one billion, twelve million, two hundred twenty-two thousand, three hundred twenty".