201521145525 has 48 divisors (see below), whose sum is σ = 381102595968. Its totient is φ = 92045664000.

The previous prime is 201521145521. The next prime is 201521145533. The reversal of 201521145525 is 525541125102.

It is not a de Polignac number, because 201521145525 - 2² = 201521145521 is a prime.

It is a super-2 number, since 2×201521145525² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201521145521) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 457515 + ... + 782535.

It is an arithmetic number, because the mean of its divisors is an integer number (7939637416).

Almost surely, 2^201521145525 is an apocalyptic number.

201521145525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

201521145525 is a deficient number, since it is larger than the sum of its proper divisors (179581450443).

201521145525 is a wasteful number, since it uses less digits than its factorization.

201521145525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326222 (or 326217 counting only the distinct ones).

The product of its (nonzero) digits is 20000, while the sum is 33.

The spelling of 201521145525 in words is "two hundred one billion, five hundred twenty-one million, one hundred forty-five thousand, five hundred twenty-five".