1221364506 has 16 divisors (see below), whose sum is σ = 2443276800. Its totient is φ = 407030208.

The previous prime is 1221364433. The next prime is 1221364519. The reversal of 1221364506 is 6054631221.

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 7 ways as a sum of consecutive naturals, for example, 9735 + ... + 50373.

It is an arithmetic number, because the mean of its divisors is an integer number (152704800).

Almost surely, 2^1221364506 is an apocalyptic number.

1221364506 is an abundant number, since it is smaller than the sum of its proper divisors (1221912294).

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

1221364506 is a wasteful number, since it uses less digits than its factorization.

1221364506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45653.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 1221364506 is about 34948.0257811511. The cubic root of 1221364506 is about 1068.9279465408.

Adding to 1221364506 its reverse (6054631221), we get a palindrome (7275995727).

The spelling of 1221364506 in words is "one billion, two hundred twenty-one million, three hundred sixty-four thousand, five hundred six".