20512120021315 has 32 divisors (see below), whose sum is σ = 26774073849600. Its totient is φ = 14995904626560.

The previous prime is 20512120021241. The next prime is 20512120021333. The reversal of 20512120021315 is 51312002121502.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-20512120021315 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20512120021315.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 693156 + ... + 6442414.

It is an arithmetic number, because the mean of its divisors is an integer number (836689807800).

Almost surely, 2^{20512120021315} is an apocalyptic number.

20512120021315 is a deficient number, since it is larger than the sum of its proper divisors (6261953828285).

20512120021315 is a wasteful number, since it uses less digits than its factorization.

20512120021315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5749827.

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 20512120021315 its reverse (51312002121502), we get a palindrome (71824122142817).

The spelling of 20512120021315 in words is "twenty trillion, five hundred twelve billion, one hundred twenty million, twenty-one thousand, three hundred fifteen".