1220022321 has 16 divisors (see below), whose sum is σ = 1872460800. Its totient is φ = 692138448.

The previous prime is 1220022311. The next prime is 1220022409. The reversal of 1220022321 is 1232200221.

It is a happy number.

It is not a de Polignac number, because 1220022321 - 2¹⁵ = 1219989553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220022321.

It is not an unprimeable number, because it can be changed into a prime (1220022311) 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, 206061 + ... + 211898.

It is an arithmetic number, because the mean of its divisors is an integer number (117028800).

Almost surely, 2^1220022321 is an apocalyptic number.

It is an amenable number.

1220022321 is a deficient number, since it is larger than the sum of its proper divisors (652438479).

1220022321 is a wasteful number, since it uses less digits than its factorization.

1220022321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418108.

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

The square root of 1220022321 is about 34928.8179158700. The cubic root of 1220022321 is about 1068.5362466807.

Adding to 1220022321 its reverse (1232200221), we get a palindrome (2452222542).

The spelling of 1220022321 in words is "one billion, two hundred twenty million, twenty-two thousand, three hundred twenty-one".