1001221219 has 4 divisors (see below), whose sum is σ = 1001307096. Its totient is φ = 1001135344.

The previous prime is 1001221187. The next prime is 1001221223. The reversal of 1001221219 is 9121221001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1001221219 - 2⁵ = 1001221187 is a prime.

It is a super-2 number, since 2×1001221219² = 2004887858751691922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001221196 and 1001221205.

It is not an unprimeable number, because it can be changed into a prime (1001221289) 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, 22069 + ... + 49894.

It is an arithmetic number, because the mean of its divisors is an integer number (250326774).

Almost surely, 2^1001221219 is an apocalyptic number.

1001221219 is a deficient number, since it is larger than the sum of its proper divisors (85877).

1001221219 is an equidigital number, since it uses as much as digits as its factorization.

1001221219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85876.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 1001221219 is about 31642.0798779094. The cubic root of 1001221219 is about 1000.4069074039.

The spelling of 1001221219 in words is "one billion, one million, two hundred twenty-one thousand, two hundred nineteen".