201521154135 has 96 divisors (see below), whose sum is σ = 388447047360. Its totient is φ = 88847044608.

The previous prime is 201521154113. The next prime is 201521154217. The reversal of 201521154135 is 531451125102.

It is not a de Polignac number, because 201521154135 - 2⁶ = 201521154071 is a prime.

It is a super-2 number, since 2×201521154135² (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 95 ways as a sum of consecutive naturals, for example, 20819917 + ... + 20829593.

It is an arithmetic number, because the mean of its divisors is an integer number (4046323410).

Almost surely, 2^201521154135 is an apocalyptic number.

201521154135 is a deficient number, since it is larger than the sum of its proper divisors (186925893225).

201521154135 is a wasteful number, since it uses less digits than its factorization.

201521154135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10705 (or 10698 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 30.

Adding to 201521154135 its reverse (531451125102), we get a palindrome (732972279237).

The spelling of 201521154135 in words is "two hundred one billion, five hundred twenty-one million, one hundred fifty-four thousand, one hundred thirty-five".