201521051215 has 32 divisors (see below), whose sum is σ = 267810665472. Its totient is φ = 144342240000.

The previous prime is 201521051213. The next prime is 201521051219. The reversal of 201521051215 is 512150125102.

It is a happy number.

It is not a de Polignac number, because 201521051215 - 2¹ = 201521051213 is a prime.

It is a super-2 number, since 2×201521051215² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201521051215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201521051213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3694390 + ... + 3748540.

It is an arithmetic number, because the mean of its divisors is an integer number (8369083296).

Almost surely, 2^201521051215 is an apocalyptic number.

201521051215 is a deficient number, since it is larger than the sum of its proper divisors (66289614257).

201521051215 is a wasteful number, since it uses less digits than its factorization.

201521051215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55191.

The product of its (nonzero) digits is 1000, while the sum is 25.

Adding to 201521051215 its reverse (512150125102), we get a palindrome (713671176317).

The spelling of 201521051215 in words is "two hundred one billion, five hundred twenty-one million, fifty-one thousand, two hundred fifteen".