1320022221 has 24 divisors (see below), whose sum is σ = 2052629280. Its totient is φ = 752365152.

The previous prime is 1320022217. The next prime is 1320022237. The reversal of 1320022221 is 1222200231.

It is a happy number.

It is not a de Polignac number, because 1320022221 - 2² = 1320022217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1320022221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320022211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47050 + ... + 69668.

It is an arithmetic number, because the mean of its divisors is an integer number (85526220).

Almost surely, 2^1320022221 is an apocalyptic number.

It is an amenable number.

1320022221 is a deficient number, since it is larger than the sum of its proper divisors (732607059).

1320022221 is a wasteful number, since it uses less digits than its factorization.

1320022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23033 (or 23026 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 1320022221 is about 36332.1100543307. The cubic root of 1320022221 is about 1096.9674659008.

Adding to 1320022221 its reverse (1222200231), we get a palindrome (2542222452).

The spelling of 1320022221 in words is "one billion, three hundred twenty million, twenty-two thousand, two hundred twenty-one".