1221000333 has 64 divisors (see below), whose sum is σ = 2111754240. Its totient is φ = 610993152.

The previous prime is 1221000329. The next prime is 1221000343. The reversal of 1221000333 is 3330001221.

It is not a de Polignac number, because 1221000333 - 2² = 1221000329 is a prime.

It is a super-2 number, since 2×1221000333² = 2981683626372221778, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221000323) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 301798 + ... + 305816.

It is an arithmetic number, because the mean of its divisors is an integer number (32996160).

Almost surely, 2^1221000333 is an apocalyptic number.

It is an amenable number.

1221000333 is a deficient number, since it is larger than the sum of its proper divisors (890753907).

1221000333 is a wasteful number, since it uses less digits than its factorization.

1221000333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4106.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 1221000333 is about 34942.8151842407. The cubic root of 1221000333 is about 1068.8216955973.

Adding to 1221000333 its reverse (3330001221), we get a palindrome (4551001554).

The spelling of 1221000333 in words is "one billion, two hundred twenty-one million, three hundred thirty-three", and thus it is an aban number.