1221324375 has 40 divisors (see below), whose sum is σ = 2078334720. Its totient is φ = 637468000.

The previous prime is 1221324373. The next prime is 1221324409. The reversal of 1221324375 is 5734231221.

It is not a de Polignac number, because 1221324375 - 2¹ = 1221324373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221324373) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 81196 + ... + 95054.

It is an arithmetic number, because the mean of its divisors is an integer number (51958368).

Almost surely, 2^1221324375 is an apocalyptic number.

1221324375 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1221324375 is a deficient number, since it is larger than the sum of its proper divisors (857010345).

1221324375 is an equidigital number, since it uses as much as digits as its factorization.

1221324375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13929 (or 13914 counting only the distinct ones).

The product of its digits is 10080, while the sum is 30.

The square root of 1221324375 is about 34947.4516238309. The cubic root of 1221324375 is about 1068.9162389746.

Adding to 1221324375 its reverse (5734231221), we get a palindrome (6955555596).

The spelling of 1221324375 in words is "one billion, two hundred twenty-one million, three hundred twenty-four thousand, three hundred seventy-five".