1022221221 has 16 divisors (see below), whose sum is σ = 1559305728. Its totient is φ = 583513200.

The previous prime is 1022221217. The next prime is 1022221231. The reversal of 1022221221 is 1221222201.

It is not a de Polignac number, because 1022221221 - 2² = 1022221217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1022221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1022221231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4675 + ... + 45456.

It is an arithmetic number, because the mean of its divisors is an integer number (97456608).

Almost surely, 2^1022221221 is an apocalyptic number.

It is an amenable number.

1022221221 is a deficient number, since it is larger than the sum of its proper divisors (537084507).

1022221221 is an equidigital number, since it uses as much as digits as its factorization.

1022221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51112.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 1022221221 is about 31972.1944977194. The cubic root of 1022221221 is about 1007.3528763652.

Adding to 1022221221 its reverse (1221222201), we get a palindrome (2243443422).

The spelling of 1022221221 in words is "one billion, twenty-two million, two hundred twenty-one thousand, two hundred twenty-one".