1012111020 has 72 divisors (see below), whose sum is σ = 3175950960. Its totient is φ = 260588160.

The previous prime is 1012110989. The next prime is 1012111039. The reversal of 1012111020 is 201112101.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1012110993 and 1012111011.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91726 + ... + 102165.

It is an arithmetic number, because the mean of its divisors is an integer number (44110430).

Almost surely, 2^1012111020 is an apocalyptic number.

1012111020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1012111020 is an abundant number, since it is smaller than the sum of its proper divisors (2163839940).

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

1012111020 is a wasteful number, since it uses less digits than its factorization.

1012111020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193935 (or 193930 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 1012111020 is about 31813.6923352194. The cubic root of 1012111020 is about 1004.0208180210.

Adding to 1012111020 its reverse (201112101), we get a palindrome (1213223121).

The spelling of 1012111020 in words is "one billion, twelve million, one hundred eleven thousand, twenty".