21021340315 has 8 divisors (see below), whose sum is σ = 25509042720. Its totient is φ = 16628116032.

The previous prime is 21021340313. The next prime is 21021340331. The reversal of 21021340315 is 51304312012.

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 21021340315 - 2¹ = 21021340313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21021340313) 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, 23619039 + ... + 23619928.

It is an arithmetic number, because the mean of its divisors is an integer number (3188630340).

Almost surely, 2^21021340315 is an apocalyptic number.

21021340315 is a deficient number, since it is larger than the sum of its proper divisors (4487702405).

21021340315 is an equidigital number, since it uses as much as digits as its factorization.

21021340315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47239061.

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 21021340315 its reverse (51304312012), we get a palindrome (72325652327).

The spelling of 21021340315 in words is "twenty-one billion, twenty-one million, three hundred forty thousand, three hundred fifteen".