21222031340 has 24 divisors (see below), whose sum is σ = 44601716880. Its totient is φ = 8482059968.

The previous prime is 21222031339. The next prime is 21222031393. The reversal of 21222031340 is 4313022212.

It is a super-2 number, since 2×21222031340² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 396227 + ... + 446586.

It is an arithmetic number, because the mean of its divisors is an integer number (1858404870).

Almost surely, 2^21222031340 is an apocalyptic number.

21222031340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222031340 is an abundant number, since it is smaller than the sum of its proper divisors (23379685540).

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

21222031340 is a wasteful number, since it uses less digits than its factorization.

21222031340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844081 (or 844079 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21222031340 its reverse (4313022212), we get a palindrome (25535053552).

The spelling of 21222031340 in words is "twenty-one billion, two hundred twenty-two million, thirty-one thousand, three hundred forty".