201121021512 has 48 divisors (see below), whose sum is σ = 544765366080. Its totient is φ = 67032636000.

The previous prime is 201121021511. The next prime is 201121021513. The reversal of 201121021512 is 215120121102.

201121021512 is a `hidden beast` number, since 20 + 112 + 1 + 0 + 21 + 512 = 666.

It is an interprime number because it is at equal distance from previous prime (201121021511) and next prime (201121021513).

It is a super-2 number, since 2×201121021512² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (201121021511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 488437 + ... + 800507.

It is an arithmetic number, because the mean of its divisors is an integer number (11349278460).

Almost surely, 2^201121021512 is an apocalyptic number.

It is an amenable number.

201121021512 is an abundant number, since it is smaller than the sum of its proper divisors (343644344568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201121021512 is a wasteful number, since it uses less digits than its factorization.

201121021512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321034 (or 321027 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

Adding to 201121021512 its reverse (215120121102), we get a palindrome (416241142614).

The spelling of 201121021512 in words is "two hundred one billion, one hundred twenty-one million, twenty-one thousand, five hundred twelve".