1243221402 has 8 divisors (see below), whose sum is σ = 2486442816. Its totient is φ = 414407132.

The previous prime is 1243221383. The next prime is 1243221439. The reversal of 1243221402 is 2041223421.

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

1243221402 is an admirable number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 103601778 + ... + 103601789.

It is an arithmetic number, because the mean of its divisors is an integer number (310805352).

Almost surely, 2^1243221402 is an apocalyptic number.

1243221402 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1243221402 is a wasteful number, since it uses less digits than its factorization.

1243221402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207203572.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 1243221402 is about 35259.3448889794. The cubic root of 1243221402 is about 1075.2666083283.

Adding to 1243221402 its reverse (2041223421), we get a palindrome (3284444823).

The spelling of 1243221402 in words is "one billion, two hundred forty-three million, two hundred twenty-one thousand, four hundred two".