1220946221 has 4 divisors (see below), whose sum is σ = 1331941344. Its totient is φ = 1109951100.

The previous prime is 1220946217. The next prime is 1220946229. The reversal of 1220946221 is 1226490221.

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 1220946221 - 2² = 1220946217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220946229) 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, 55497545 + ... + 55497566.

It is an arithmetic number, because the mean of its divisors is an integer number (332985336).

Almost surely, 2^1220946221 is an apocalyptic number.

1220946221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1220946221 is a deficient number, since it is larger than the sum of its proper divisors (110995123).

1220946221 is a wasteful number, since it uses less digits than its factorization.

1220946221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110995122.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 1220946221 is about 34942.0408820092. The cubic root of 1220946221 is about 1068.8059061028.

The spelling of 1220946221 in words is "one billion, two hundred twenty million, nine hundred forty-six thousand, two hundred twenty-one".