21021631699417 has 8 divisors (see below), whose sum is σ = 21378115497600. Its totient is φ = 20665154066544.

The previous prime is 21021631699361. The next prime is 21021631699427. The reversal of 21021631699417 is 71499613612012.

It is a happy number.

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 21021631699417 - 2¹⁵ = 21021631666649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021631699427) 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, 5615184 + ... + 8577502.

It is an arithmetic number, because the mean of its divisors is an integer number (2672264437200).

Almost surely, 2^{21021631699417} is an apocalyptic number.

It is an amenable number.

21021631699417 is a deficient number, since it is larger than the sum of its proper divisors (356483798183).

21021631699417 is a wasteful number, since it uses less digits than its factorization.

21021631699417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3082655.

The product of its (nonzero) digits is 979776, while the sum is 52.

The spelling of 21021631699417 in words is "twenty-one trillion, twenty-one billion, six hundred thirty-one million, six hundred ninety-nine thousand, four hundred seventeen".