21106753746 has 24 divisors (see below), whose sum is σ = 45710486640. Its totient is φ = 6494385456.

The previous prime is 21106753741. The next prime is 21106753757. The reversal of 21106753746 is 64735760112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21106753698 and 21106753707.

It is not an unprimeable number, because it can be changed into a prime (21106753741) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10406656 + ... + 10408683.

It is an arithmetic number, because the mean of its divisors is an integer number (1904603610).

Almost surely, 2^21106753746 is an apocalyptic number.

21106753746 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21106753746 is an abundant number, since it is smaller than the sum of its proper divisors (24603732894).

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

21106753746 is a wasteful number, since it uses less digits than its factorization.

21106753746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20815370 (or 20815357 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 42.

The spelling of 21106753746 in words is "twenty-one billion, one hundred six million, seven hundred fifty-three thousand, seven hundred forty-six".