21122221331244 has 72 divisors (see below), whose sum is σ = 54799242063552. Its totient is φ = 6279905602880.

The previous prime is 21122221331161. The next prime is 21122221331287. The reversal of 21122221331244 is 44213312222112.

It is a super-2 number, since 2×21122221331244² (a number of 27 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28112094 + ... + 28853669.

It is an arithmetic number, because the mean of its divisors is an integer number (761100584216).

Almost surely, 2^{21122221331244} is an apocalyptic number.

It is an amenable number.

21122221331244 is an abundant number, since it is smaller than the sum of its proper divisors (33677020732308).

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

21122221331244 is a wasteful number, since it uses less digits than its factorization.

21122221331244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56965887 (or 56965832 counting only the distinct ones).

The product of its digits is 9216, while the sum is 30.

Adding to 21122221331244 its reverse (44213312222112), we get a palindrome (65335533553356).

The spelling of 21122221331244 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred twenty-one million, three hundred thirty-one thousand, two hundred forty-four".