21826809315 has 64 divisors (see below), whose sum is σ = 39278891520. Its totient is φ = 11499096960.

The previous prime is 21826809311. The next prime is 21826809317. The reversal of 21826809315 is 51390862812.

It is not a de Polignac number, because 21826809315 - 2² = 21826809311 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (21826809311) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4011777 + ... + 4017213.

It is an arithmetic number, because the mean of its divisors is an integer number (613732680).

Almost surely, 2^21826809315 is an apocalyptic number.

21826809315 is a deficient number, since it is larger than the sum of its proper divisors (17452082205).

21826809315 is a wasteful number, since it uses less digits than its factorization.

21826809315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5809 (or 5803 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The spelling of 21826809315 in words is "twenty-one billion, eight hundred twenty-six million, eight hundred nine thousand, three hundred fifteen".