21191626926 has 24 divisors (see below), whose sum is σ = 46024270344. Its totient is φ = 7047094320.

The previous prime is 21191626871. The next prime is 21191626943. The reversal of 21191626926 is 62962619112.

21191626926 is a `hidden beast` number, since 2 + 1 + 19 + 1 + 626 + 9 + 2 + 6 = 666.

It is a nude number because it is divisible by every one of its digits.

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, 1390656 + ... + 1405811.

It is an arithmetic number, because the mean of its divisors is an integer number (1917677931).

Almost surely, 2^21191626926 is an apocalyptic number.

21191626926 is an abundant number, since it is smaller than the sum of its proper divisors (24832643418).

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

21191626926 is a wasteful number, since it uses less digits than its factorization.

21191626926 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2796896 (or 2796893 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The spelling of 21191626926 in words is "twenty-one billion, one hundred ninety-one million, six hundred twenty-six thousand, nine hundred twenty-six".