1021512112 has 20 divisors (see below), whose sum is σ = 1993422760. Its totient is φ = 507080448.

The previous prime is 1021512109. The next prime is 1021512119. The reversal of 1021512112 is 2112151201.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (1021512119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 227433 + ... + 231880.

It is an arithmetic number, because the mean of its divisors is an integer number (99671138).

Almost surely, 2^1021512112 is an apocalyptic number.

It is an amenable number.

1021512112 is a deficient number, since it is larger than the sum of its proper divisors (971910648).

1021512112 is a wasteful number, since it uses less digits than its factorization.

1021512112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459460 (or 459454 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 16.

The square root of 1021512112 is about 31961.1031098740. The cubic root of 1021512112 is about 1007.1198908452.

Adding to 1021512112 its reverse (2112151201), we get a palindrome (3133663313).

The spelling of 1021512112 in words is "one billion, twenty-one million, five hundred twelve thousand, one hundred twelve".