21122242412 has 24 divisors (see below), whose sum is σ = 37493598240. Its totient is φ = 10409857920.

The previous prime is 21122242397. The next prime is 21122242457. The reversal of 21122242412 is 21424222112.

It is a super-2 number, since 2×21122242412² (a number of 21 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 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, 1831448 + ... + 1842944.

It is an arithmetic number, because the mean of its divisors is an integer number (1562233260).

Almost surely, 2^21122242412 is an apocalyptic number.

It is an amenable number.

21122242412 is a deficient number, since it is larger than the sum of its proper divisors (16371355828).

21122242412 is a wasteful number, since it uses less digits than its factorization.

21122242412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18041 (or 18039 counting only the distinct ones).

The product of its digits is 1024, while the sum is 23.

Adding to 21122242412 its reverse (21424222112), we get a palindrome (42546464524).

The spelling of 21122242412 in words is "twenty-one billion, one hundred twenty-two million, two hundred forty-two thousand, four hundred twelve".