1101012021 has 20 divisors (see below), whose sum is σ = 1741472172. Its totient is φ = 690830208.

The previous prime is 1101011957. The next prime is 1101012023. The reversal of 1101012021 is 1202101011.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 367143921 + 733868100 = 19161^2 + 27090^2 .

It is not a de Polignac number, because 1101012021 - 2⁶ = 1101011957 is a prime.

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 = 1101011994 and 1101012012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101012023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 398410 + ... + 401163.

Almost surely, 2^1101012021 is an apocalyptic number.

It is an amenable number.

1101012021 is a deficient number, since it is larger than the sum of its proper divisors (640460151).

1101012021 is an equidigital number, since it uses as much as digits as its factorization.

1101012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799602 (or 799593 counting only the distinct ones).

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

The square root of 1101012021 is about 33181.5011866552. The cubic root of 1101012021 is about 1032.5965908928.

Adding to 1101012021 its reverse (1202101011), we get a palindrome (2303113032).

The spelling of 1101012021 in words is "one billion, one hundred one million, twelve thousand, twenty-one".