1120220021 has 4 divisors (see below), whose sum is σ = 1120309344. Its totient is φ = 1120130700.

The previous prime is 1120220011. The next prime is 1120220039. The reversal of 1120220021 is 1200220211.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1120220021 - 2⁶ = 1120219957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1120219984 and 1120220011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1120220011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22025 + ... + 52206.

It is an arithmetic number, because the mean of its divisors is an integer number (280077336).

Almost surely, 2^1120220021 is an apocalyptic number.

It is an amenable number.

1120220021 is a deficient number, since it is larger than the sum of its proper divisors (89323).

1120220021 is an equidigital number, since it uses as much as digits as its factorization.

1120220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89322.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1120220021 is about 33469.6880923620. The cubic root of 1120220021 is about 1038.5668193549.

Adding to 1120220021 its reverse (1200220211), we get a palindrome (2320440232).

The spelling of 1120220021 in words is "one billion, one hundred twenty million, two hundred twenty thousand, twenty-one".