21112444402 has 32 divisors (see below), whose sum is σ = 36705537792. Its totient is φ = 8920710144.

The previous prime is 21112444393. The next prime is 21112444421. The reversal of 21112444402 is 20444421112.

It is a happy number.

It is a super-2 number, since 2×21112444402² (a number of 21 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 327598 + ... + 386710.

It is an arithmetic number, because the mean of its divisors is an integer number (1147048056).

Almost surely, 2^21112444402 is an apocalyptic number.

21112444402 is a deficient number, since it is larger than the sum of its proper divisors (15593093390).

21112444402 is a wasteful number, since it uses less digits than its factorization.

21112444402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59482.

The product of its (nonzero) digits is 2048, while the sum is 25.

Adding to 21112444402 its reverse (20444421112), we get a palindrome (41556865514).

The spelling of 21112444402 in words is "twenty-one billion, one hundred twelve million, four hundred forty-four thousand, four hundred two".