21630025726 has 8 divisors (see below), whose sum is σ = 32855735520. Its totient is φ = 10678113888.

The previous prime is 21630025709. The next prime is 21630025763. The reversal of 21630025726 is 62752003612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21630025691 and 21630025700.

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, 68449291 + ... + 68449606.

It is an arithmetic number, because the mean of its divisors is an integer number (4106966940).

Almost surely, 2^21630025726 is an apocalyptic number.

21630025726 is a deficient number, since it is larger than the sum of its proper divisors (11225709794).

21630025726 is a wasteful number, since it uses less digits than its factorization.

21630025726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136898978.

The product of its (nonzero) digits is 30240, while the sum is 34.

The spelling of 21630025726 in words is "twenty-one billion, six hundred thirty million, twenty-five thousand, seven hundred twenty-six".