21291046653 has 8 divisors (see below), whose sum is σ = 30057948288. Its totient is φ = 13359088064.

The previous prime is 21291046631. The next prime is 21291046669. The reversal of 21291046653 is 35664019212.

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

It is a cyclic number.

It is not a de Polignac number, because 21291046653 - 2³² = 16996079357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21291046253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208735701 + ... + 208735802.

It is an arithmetic number, because the mean of its divisors is an integer number (3757243536).

Almost surely, 2^21291046653 is an apocalyptic number.

It is an amenable number.

21291046653 is a deficient number, since it is larger than the sum of its proper divisors (8766901635).

21291046653 is a wasteful number, since it uses less digits than its factorization.

21291046653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417471523.

The product of its (nonzero) digits is 77760, while the sum is 39.

The spelling of 21291046653 in words is "twenty-one billion, two hundred ninety-one million, forty-six thousand, six hundred fifty-three".