1221001994 has 8 divisors (see below), whose sum is σ = 1833369120. Its totient is φ = 609878956.

The previous prime is 1221001987. The next prime is 1221002009. The reversal of 1221001994 is 4991001221.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 308564 + ... + 312495.

It is an arithmetic number, because the mean of its divisors is an integer number (229171140).

Almost surely, 2^1221001994 is an apocalyptic number.

1221001994 is a deficient number, since it is larger than the sum of its proper divisors (612367126).

1221001994 is an equidigital number, since it uses as much as digits as its factorization.

1221001994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622044.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 1221001994 is about 34942.8389516364. The cubic root of 1221001994 is about 1068.8221802578.

The spelling of 1221001994 in words is "one billion, two hundred twenty-one million, one thousand, nine hundred ninety-four".