1120020021 has 8 divisors (see below), whose sum is σ = 1659288960. Its totient is φ = 746679996.

The previous prime is 1120019977. The next prime is 1120020023. The reversal of 1120020021 is 1200200211.

It is not a de Polignac number, because 1120020021 - 2¹⁷ = 1119888949 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 = 1120019985 and 1120020012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1120020023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20741085 + ... + 20741138.

It is an arithmetic number, because the mean of its divisors is an integer number (207411120).

Almost surely, 2^1120020021 is an apocalyptic number.

It is an amenable number.

1120020021 is a deficient number, since it is larger than the sum of its proper divisors (539268939).

1120020021 is an equidigital number, since it uses as much as digits as its factorization.

1120020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41482232 (or 41482226 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1120020021 is about 33466.7001809261. The cubic root of 1120020021 is about 1038.5050083646.

Adding to 1120020021 its reverse (1200200211), we get a palindrome (2320220232).

The spelling of 1120020021 in words is "one billion, one hundred twenty million, twenty thousand, twenty-one".