20121315 has 16 divisors (see below), whose sum is σ = 32250528. Its totient is φ = 10712576.

The previous prime is 20121307. The next prime is 20121337. The reversal of 20121315 is 51312102.

It is a cyclic number.

It is not a de Polignac number, because 20121315 - 2³ = 20121307 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a junction number, because it is equal to n+sod(n) for n = 20121294 and 20121303.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13969 + ... + 15341.

It is an arithmetic number, because the mean of its divisors is an integer number (2015658).

Almost surely, 2^20121315 is an apocalyptic number.

20121315 is a deficient number, since it is larger than the sum of its proper divisors (12129213).

20121315 is a wasteful number, since it uses less digits than its factorization.

20121315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2358.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 20121315 is about 4485.6788783862. The cubic root of 20121315 is about 271.9894883121.

Adding to 20121315 its reverse (51312102), we get a palindrome (71433417).

The spelling of 20121315 in words is "twenty million, one hundred twenty-one thousand, three hundred fifteen".