21226634605 has 32 divisors (see below), whose sum is σ = 30970719360. Its totient is φ = 13764741120.

The previous prime is 21226634591. The next prime is 21226634623. The reversal of 21226634605 is 50643662212.

It is a de Polignac number, because none of the positive numbers 2^k-21226634605 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 579664 + ... + 615193.

It is an arithmetic number, because the mean of its divisors is an integer number (967834980).

Almost surely, 2^21226634605 is an apocalyptic number.

It is an amenable number.

21226634605 is a deficient number, since it is larger than the sum of its proper divisors (9744084755).

21226634605 is a wasteful number, since it uses less digits than its factorization.

21226634605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1194909.

The product of its (nonzero) digits is 103680, while the sum is 37.

The spelling of 21226634605 in words is "twenty-one billion, two hundred twenty-six million, six hundred thirty-four thousand, six hundred five".