1012227021 has 18 divisors (see below), whose sum is σ = 1583229258. Its totient is φ = 622908000.

The previous prime is 1012226981. The next prime is 1012227031. The reversal of 1012227021 is 1207222101.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 6702921 + 1005524100 = 2589^2 + 31710^2 .

It is not a de Polignac number, because 1012227021 - 2⁷ = 1012226893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1012226985 and 1012227003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012227031) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 331230 + ... + 334271.

It is an arithmetic number, because the mean of its divisors is an integer number (87957181).

Almost surely, 2^1012227021 is an apocalyptic number.

It is an amenable number.

1012227021 is a deficient number, since it is larger than the sum of its proper divisors (571002237).

1012227021 is a wasteful number, since it uses less digits than its factorization.

1012227021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665533 (or 665517 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 1012227021 is about 31815.5154130811. The cubic root of 1012227021 is about 1004.0591744750.

Adding to 1012227021 its reverse (1207222101), we get a palindrome (2219449122).

The spelling of 1012227021 in words is "one billion, twelve million, two hundred twenty-seven thousand, twenty-one".