1324121721 has 32 divisors (see below), whose sum is σ = 2021741568. Its totient is φ = 763637760.

The previous prime is 1324121713. The next prime is 1324121731. The reversal of 1324121721 is 1271214231.

It is not a de Polignac number, because 1324121721 - 2³ = 1324121713 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1324121691 and 1324121700.

It is not an unprimeable number, because it can be changed into a prime (1324121731) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 155640 + ... + 163926.

It is an arithmetic number, because the mean of its divisors is an integer number (63179424).

Almost surely, 2^1324121721 is an apocalyptic number.

It is an amenable number.

1324121721 is a deficient number, since it is larger than the sum of its proper divisors (697619847).

1324121721 is a wasteful number, since it uses less digits than its factorization.

1324121721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8561.

The product of its digits is 672, while the sum is 24.

The square root of 1324121721 is about 36388.4833566886. The cubic root of 1324121721 is about 1098.1018838707.

Adding to 1324121721 its reverse (1271214231), we get a palindrome (2595335952).

The spelling of 1324121721 in words is "one billion, three hundred twenty-four million, one hundred twenty-one thousand, seven hundred twenty-one".