1221220982 has 4 divisors (see below), whose sum is σ = 1831831476. Its totient is φ = 610610490.

The previous prime is 1221220981. The next prime is 1221221003. The reversal of 1221220982 is 2890221221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221220981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305305244 + ... + 305305247.

It is an arithmetic number, because the mean of its divisors is an integer number (457957869).

Almost surely, 2^1221220982 is an apocalyptic number.

1221220982 is a deficient number, since it is larger than the sum of its proper divisors (610610494).

1221220982 is an equidigital number, since it uses as much as digits as its factorization.

1221220982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610610493.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 1221220982 is about 34945.9723287248. The cubic root of 1221220982 is about 1068.8860745679.

The spelling of 1221220982 in words is "one billion, two hundred twenty-one million, two hundred twenty thousand, nine hundred eighty-two".