1221985082 has 4 divisors (see below), whose sum is σ = 1832977626. Its totient is φ = 610992540.

The previous prime is 1221985081. The next prime is 1221985111. The reversal of 1221985082 is 2805891221.

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

It can be written as a sum of positive squares in only one way, i.e., 1108157521 + 113827561 = 33289^2 + 10669^2 .

It is not an unprimeable number, because it can be changed into a prime (1221985081) 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 as a sum of consecutive naturals, namely, 305496269 + ... + 305496272.

Almost surely, 2^1221985082 is an apocalyptic number.

1221985082 is a deficient number, since it is larger than the sum of its proper divisors (610992544).

1221985082 is an equidigital number, since it uses as much as digits as its factorization.

1221985082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610992543.

The product of its (nonzero) digits is 23040, while the sum is 38.

The square root of 1221985082 is about 34956.9032095236. The cubic root of 1221985082 is about 1069.1089568529.

The spelling of 1221985082 in words is "one billion, two hundred twenty-one million, nine hundred eighty-five thousand, eighty-two".