1011222021 has 4 divisors (see below), whose sum is σ = 1348296032. Its totient is φ = 674148012.

The previous prime is 1011222001. The next prime is 1011222031. The reversal of 1011222021 is 1202221101.

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.

It is not a de Polignac number, because 1011222021 - 2⁶ = 1011221957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011221988 and 1011222006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011222001) 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 3 ways as a sum of consecutive naturals, for example, 168537001 + ... + 168537006.

It is an arithmetic number, because the mean of its divisors is an integer number (337074008).

Almost surely, 2^1011222021 is an apocalyptic number.

It is an amenable number.

1011222021 is a deficient number, since it is larger than the sum of its proper divisors (337074011).

1011222021 is an equidigital number, since it uses as much as digits as its factorization.

1011222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337074010.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1011222021 is about 31799.7173100643. The cubic root of 1011222021 is about 1003.7267676164.

Adding to 1011222021 its reverse (1202221101), we get a palindrome (2213443122).

The spelling of 1011222021 in words is "one billion, eleven million, two hundred twenty-two thousand, twenty-one".