21351446717 has 8 divisors (see below), whose sum is σ = 21562000416. Its totient is φ = 21141097072.

The previous prime is 21351446657. The next prime is 21351446723. The reversal of 21351446717 is 71764415312.

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 21351446717 - 2¹⁴ = 21351430333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21351446777) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 163718 + ... + 263640.

It is an arithmetic number, because the mean of its divisors is an integer number (2695250052).

Almost surely, 2^21351446717 is an apocalyptic number.

It is an amenable number.

21351446717 is a deficient number, since it is larger than the sum of its proper divisors (210553699).

21351446717 is a wasteful number, since it uses less digits than its factorization.

21351446717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102027.

The product of its digits is 141120, while the sum is 41.

The spelling of 21351446717 in words is "twenty-one billion, three hundred fifty-one million, four hundred forty-six thousand, seven hundred seventeen".