1001221994 has 8 divisors (see below), whose sum is σ = 1504033920. Its totient is φ = 499877356.

The previous prime is 1001221981. The next prime is 1001221999. The reversal of 1001221994 is 4991221001.

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

It is not an unprimeable number, because it can be changed into a prime (1001221999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 365114 + ... + 367845.

It is an arithmetic number, because the mean of its divisors is an integer number (188004240).

Almost surely, 2^1001221994 is an apocalyptic number.

1001221994 is a deficient number, since it is larger than the sum of its proper divisors (502811926).

1001221994 is an equidigital number, since it uses as much as digits as its factorization.

1001221994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 733644.

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

The square root of 1001221994 is about 31642.0921242575. The cubic root of 1001221994 is about 1000.4071655271.

Adding to 1001221994 its reverse (4991221001), we get a palindrome (5992442995).

The spelling of 1001221994 in words is "one billion, one million, two hundred twenty-one thousand, nine hundred ninety-four".