21122344412 has 24 divisors (see below), whose sum is σ = 40778413872. Its totient is φ = 9510998400.

The previous prime is 21122344393. The next prime is 21122344429. The reversal of 21122344412 is 21444322112.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4951514 + ... + 4955777.

It is an arithmetic number, because the mean of its divisors is an integer number (1699100578).

Almost surely, 2^21122344412 is an apocalyptic number.

It is an amenable number.

21122344412 is a deficient number, since it is larger than the sum of its proper divisors (19656069460).

21122344412 is a wasteful number, since it uses less digits than its factorization.

21122344412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9907349 (or 9907347 counting only the distinct ones).

The product of its digits is 3072, while the sum is 26.

Adding to 21122344412 its reverse (21444322112), we get a palindrome (42566666524).

The spelling of 21122344412 in words is "twenty-one billion, one hundred twenty-two million, three hundred forty-four thousand, four hundred twelve".