21112213446 has 24 divisors (see below), whose sum is σ = 45870561360. Its totient is φ = 7017799536.

The previous prime is 21112213387. The next prime is 21112213501. The reversal of 21112213446 is 64431221112.

21112213446 is a `hidden beast` number, since 2 + 1 + 1 + 1 + 2 + 213 + 446 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1627105 + ... + 1640028.

It is an arithmetic number, because the mean of its divisors is an integer number (1911273390).

Almost surely, 2^21112213446 is an apocalyptic number.

21112213446 is an abundant number, since it is smaller than the sum of its proper divisors (24758347914).

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

21112213446 is a wasteful number, since it uses less digits than its factorization.

21112213446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3267500 (or 3267497 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

Adding to 21112213446 its reverse (64431221112), we get a palindrome (85543434558).

The spelling of 21112213446 in words is "twenty-one billion, one hundred twelve million, two hundred thirteen thousand, four hundred forty-six".