1221323414 has 16 divisors (see below), whose sum is σ = 1947709152. Its totient is φ = 573089088.

The previous prime is 1221323387. The next prime is 1221323431. The reversal of 1221323414 is 4143231221.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a self number, because there is not a number n which added to its sum of digits gives 1221323414.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 248039 + ... + 252914.

It is an arithmetic number, because the mean of its divisors is an integer number (121731822).

Almost surely, 2^1221323414 is an apocalyptic number.

1221323414 is a deficient number, since it is larger than the sum of its proper divisors (726385738).

1221323414 is a wasteful number, since it uses less digits than its factorization.

1221323414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501031.

The product of its digits is 1152, while the sum is 23.

The square root of 1221323414 is about 34947.4378746139. The cubic root of 1221323414 is about 1068.9159586153.

Adding to 1221323414 its reverse (4143231221), we get a palindrome (5364554635).

The spelling of 1221323414 in words is "one billion, two hundred twenty-one million, three hundred twenty-three thousand, four hundred fourteen".