1012021101 has 64 divisors (see below), whose sum is σ = 1953907200. Its totient is φ = 502391808.

The previous prime is 1012021093. The next prime is 1012021117. The reversal of 1012021101 is 1011202101.

It is a happy number.

It is not a de Polignac number, because 1012021101 - 2³ = 1012021093 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012021001) 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 63 ways as a sum of consecutive naturals, for example, 29655 + ... + 53883.

It is an arithmetic number, because the mean of its divisors is an integer number (30529800).

Almost surely, 2^1012021101 is an apocalyptic number.

It is an amenable number.

1012021101 is a deficient number, since it is larger than the sum of its proper divisors (941886099).

1012021101 is a wasteful number, since it uses less digits than its factorization.

1012021101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24275 (or 24269 counting only the distinct ones).

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

The square root of 1012021101 is about 31812.2790915709. The cubic root of 1012021101 is about 1003.9910837264.

Adding to 1012021101 its reverse (1011202101), we get a palindrome (2023223202).

It can be divided in two parts, 101 and 2021101, that added together give a palindrome (2021202).

The spelling of 1012021101 in words is "one billion, twelve million, twenty-one thousand, one hundred one".