21312021301215 has 8 divisors (see below), whose sum is σ = 34099234081968. Its totient is φ = 11366411360640.

The previous prime is 21312021301177. The next prime is 21312021301271. The reversal of 21312021301215 is 51210312021312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21312021301215 - 2⁸ = 21312021300959 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 710400710026 + ... + 710400710055.

It is an arithmetic number, because the mean of its divisors is an integer number (4262404260246).

Almost surely, 2^{21312021301215} is an apocalyptic number.

21312021301215 is a deficient number, since it is larger than the sum of its proper divisors (12787212780753).

21312021301215 is a wasteful number, since it uses less digits than its factorization.

21312021301215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1420801420089.

The product of its (nonzero) digits is 720, while the sum is 24.

Adding to 21312021301215 its reverse (51210312021312), we get a palindrome (72522333322527).

The spelling of 21312021301215 in words is "twenty-one trillion, three hundred twelve billion, twenty-one million, three hundred one thousand, two hundred fifteen".