1220990221 has 8 divisors (see below), whose sum is σ = 1333947744. Its totient is φ = 1108359120.

The previous prime is 1220990159. The next prime is 1220990227.

1220990221 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1220990221 - 2¹¹ = 1220988173 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220990221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220990227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73746 + ... + 88771.

It is an arithmetic number, because the mean of its divisors is an integer number (166743468).

Almost surely, 2^1220990221 is an apocalyptic number.

1220990221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1220990221 is a deficient number, since it is larger than the sum of its proper divisors (112957523).

1220990221 is a wasteful number, since it uses less digits than its factorization.

1220990221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163211.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 1220990221 is about 34942.6704903904. The cubic root of 1220990221 is about 1068.8187450234.

The spelling of 1220990221 in words is "one billion, two hundred twenty million, nine hundred ninety thousand, two hundred twenty-one".