201521052215 has 24 divisors (see below), whose sum is σ = 288168097392. Its totient is φ = 134815470720.

The previous prime is 201521052191. The next prime is 201521052221. The reversal of 201521052215 is 512250125102.

It is a happy number.

It is not a de Polignac number, because 201521052215 - 2³⁴ = 184341183031 is a prime.

It is a super-2 number, since 2×201521052215² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10020869 + ... + 10040958.

It is an arithmetic number, because the mean of its divisors is an integer number (12007004058).

Almost surely, 2^201521052215 is an apocalyptic number.

201521052215 is a deficient number, since it is larger than the sum of its proper divisors (86647045177).

201521052215 is a wasteful number, since it uses less digits than its factorization.

201521052215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20061887 (or 20061880 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 26.

Adding to 201521052215 its reverse (512250125102), we get a palindrome (713771177317).

The spelling of 201521052215 in words is "two hundred one billion, five hundred twenty-one million, fifty-two thousand, two hundred fifteen".