1011120021 has 6 divisors (see below), whose sum is σ = 1460506710. Its totient is φ = 674080008.

The previous prime is 1011120013. The next prime is 1011120023. The reversal of 1011120021 is 1200211101.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 929579121 + 81540900 = 30489^2 + 9030^2 .

It is not a de Polignac number, because 1011120021 - 2³ = 1011120013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 112346669 = 1011120021 / (1 + 0 + 1 + 1 + 1 + 2 + 0 + 0 + 2 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 1011119985 and 1011120012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011120023) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 56173326 + ... + 56173343.

It is an arithmetic number, because the mean of its divisors is an integer number (243417785).

Almost surely, 2^1011120021 is an apocalyptic number.

It is an amenable number.

1011120021 is a deficient number, since it is larger than the sum of its proper divisors (449386689).

1011120021 is a wasteful number, since it uses less digits than its factorization.

1011120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112346675 (or 112346672 counting only the distinct ones).

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

The square root of 1011120021 is about 31798.1134817775. The cubic root of 1011120021 is about 1003.6930184921.

Adding to 1011120021 its reverse (1200211101), we get a palindrome (2211331122).

The spelling of 1011120021 in words is "one billion, eleven million, one hundred twenty thousand, twenty-one".