20201215215 has 32 divisors (see below), whose sum is σ = 34154219520. Its totient is φ = 10175083776.

The previous prime is 20201215213. The next prime is 20201215217. The reversal of 20201215215 is 51251210202.

It is an interprime number because it is at equal distance from previous prime (20201215213) and next prime (20201215217).

It is not a de Polignac number, because 20201215215 - 2¹ = 20201215213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20201215191 and 20201215200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201215213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 343342 + ... + 397851.

It is an arithmetic number, because the mean of its divisors is an integer number (1067319360).

Almost surely, 2^20201215215 is an apocalyptic number.

20201215215 is a deficient number, since it is larger than the sum of its proper divisors (13953004305).

20201215215 is a wasteful number, since it uses less digits than its factorization.

20201215215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 741303.

The product of its (nonzero) digits is 400, while the sum is 21.

Adding to 20201215215 its reverse (51251210202), we get a palindrome (71452425417).

The spelling of 20201215215 in words is "twenty billion, two hundred one million, two hundred fifteen thousand, two hundred fifteen".