1022220221 has 6 divisors (see below), whose sum is σ = 1123597566. Its totient is φ = 929291000.

The previous prime is 1022220167. The next prime is 1022220223. The reversal of 1022220221 is 1220222201.

It can be written as a sum of positive squares in only one way, i.e., 538704100 + 483516121 = 23210^2 + 21989^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1022220221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1022220196 and 1022220205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1022220223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4223930 + ... + 4224171.

It is an arithmetic number, because the mean of its divisors is an integer number (187266261).

Almost surely, 2^1022220221 is an apocalyptic number.

1022220221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1022220221 is a deficient number, since it is larger than the sum of its proper divisors (101377345).

1022220221 is an equidigital number, since it uses as much as digits as its factorization.

1022220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8448123 (or 8448112 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 1022220221 is about 31972.1788591269. The cubic root of 1022220221 is about 1007.3525478802.

Adding to 1022220221 its reverse (1220222201), we get a palindrome (2242442422).

The spelling of 1022220221 in words is "one billion, twenty-two million, two hundred twenty thousand, two hundred twenty-one".