1021233221 has 4 divisors (see below), whose sum is σ = 1021836000. Its totient is φ = 1020630444.

The previous prime is 1021233179. The next prime is 1021233251. The reversal of 1021233221 is 1223321201.

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 an emirpimes, since its reverse is a distinct semiprime: 1223321201 = 1549 ⋅789749.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021233221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1021233221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021233251) 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, 298841 + ... + 302238.

It is an arithmetic number, because the mean of its divisors is an integer number (255459000).

Almost surely, 2^1021233221 is an apocalyptic number.

It is an amenable number.

1021233221 is a deficient number, since it is larger than the sum of its proper divisors (602779).

1021233221 is an equidigital number, since it uses as much as digits as its factorization.

1021233221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602778.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1021233221 is about 31956.7398368482. The cubic root of 1021233221 is about 1007.0282286138.

Adding to 1021233221 its reverse (1223321201), we get a palindrome (2244554422).

The spelling of 1021233221 in words is "one billion, twenty-one million, two hundred thirty-three thousand, two hundred twenty-one".