1022001221 has 4 divisors (see below), whose sum is σ = 1023708000. Its totient is φ = 1020294444.

The previous prime is 1022001187. The next prime is 1022001289. The reversal of 1022001221 is 1221002201.

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.

It is a cyclic number.

It is not a de Polignac number, because 1022001221 - 2¹⁰ = 1022000197 is a prime.

It is a Duffinian number.

1022001221 is a modest number, since divided by 1221 gives 1022 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1022001821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 852491 + ... + 853688.

It is an arithmetic number, because the mean of its divisors is an integer number (255927000).

Almost surely, 2^1022001221 is an apocalyptic number.

It is an amenable number.

1022001221 is a deficient number, since it is larger than the sum of its proper divisors (1706779).

1022001221 is an equidigital number, since it uses as much as digits as its factorization.

1022001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1706778.

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

The square root of 1022001221 is about 31968.7538230692. The cubic root of 1022001221 is about 1007.2806044901.

Adding to 1022001221 its reverse (1221002201), we get a palindrome (2243003422).

The spelling of 1022001221 in words is "one billion, twenty-two million, one thousand, two hundred twenty-one".