21415837317 has 16 divisors (see below), whose sum is σ = 32649805440. Its totient is φ = 12231565632.

The previous prime is 21415837301. The next prime is 21415837319. The reversal of 21415837317 is 71373851412.

It is not a de Polignac number, because 21415837317 - 2⁴ = 21415837301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21415837319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 208698 + ... + 293915.

It is an arithmetic number, because the mean of its divisors is an integer number (2040612840).

Almost surely, 2^21415837317 is an apocalyptic number.

It is an amenable number.

21415837317 is a deficient number, since it is larger than the sum of its proper divisors (11233968123).

21415837317 is a wasteful number, since it uses less digits than its factorization.

21415837317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504652.

The product of its digits is 141120, while the sum is 42.

The spelling of 21415837317 in words is "twenty-one billion, four hundred fifteen million, eight hundred thirty-seven thousand, three hundred seventeen".