21106235744 has 24 divisors (see below), whose sum is σ = 45330438888. Its totient is φ = 9593743360.

The previous prime is 21106235707. The next prime is 21106235803. The reversal of 21106235744 is 44753260112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29980097 + ... + 29980800.

It is an arithmetic number, because the mean of its divisors is an integer number (1888768287).

Almost surely, 2^21106235744 is an apocalyptic number.

It is an amenable number.

21106235744 is an abundant number, since it is smaller than the sum of its proper divisors (24224203144).

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

21106235744 is a wasteful number, since it uses less digits than its factorization.

21106235744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59960918 (or 59960910 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 35.

Adding to 21106235744 its reverse (44753260112), we get a palindrome (65859495856).

The spelling of 21106235744 in words is "twenty-one billion, one hundred six million, two hundred thirty-five thousand, seven hundred forty-four".