1012111021 has 4 divisors (see below), whose sum is σ = 1056115872. Its totient is φ = 968106172.

The previous prime is 1012110989. The next prime is 1012111039. The reversal of 1012111021 is 1201112101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1012111021 - 2⁵ = 1012110989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1012110989 and 1012111007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012111091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22002391 + ... + 22002436.

It is an arithmetic number, because the mean of its divisors is an integer number (264028968).

Almost surely, 2^1012111021 is an apocalyptic number.

It is an amenable number.

1012111021 is a deficient number, since it is larger than the sum of its proper divisors (44004851).

1012111021 is an equidigital number, since it uses as much as digits as its factorization.

1012111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44004850.

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 1012111021 is about 31813.6923509359. The cubic root of 1012111021 is about 1004.0208183516.

Adding to 1012111021 its reverse (1201112101), we get a palindrome (2213223122).

The spelling of 1012111021 in words is "one billion, twelve million, one hundred eleven thousand, twenty-one".