21231201315 has 16 divisors (see below), whose sum is σ = 35968153248. Its totient is φ = 10657230336.

The previous prime is 21231201301. The next prime is 21231201317. The reversal of 21231201315 is 51310213212.

It is not a de Polignac number, because 21231201315 - 2⁵ = 21231201283 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21231201291 and 21231201300.

It is not an unprimeable number, because it can be changed into a prime (21231201317) 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, 41629552 + ... + 41630061.

It is an arithmetic number, because the mean of its divisors is an integer number (2248009578).

Almost surely, 2^21231201315 is an apocalyptic number.

21231201315 is a deficient number, since it is larger than the sum of its proper divisors (14736951933).

21231201315 is a wasteful number, since it uses less digits than its factorization.

21231201315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83259638.

The product of its (nonzero) digits is 360, while the sum is 21.

Adding to 21231201315 its reverse (51310213212), we get a palindrome (72541414527).

The spelling of 21231201315 in words is "twenty-one billion, two hundred thirty-one million, two hundred one thousand, three hundred fifteen".