109824721 has 2 divisors, whose sum is σ = 109824722. Its totient is φ = 109824720.

The previous prime is 109824713. The next prime is 109824727. The reversal of 109824721 is 127428901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84180625 + 25644096 = 9175^2 + 5064^2 .

It is a cyclic number.

It is not a de Polignac number, because 109824721 - 2³ = 109824713 is a prime.

It is a super-2 number, since 2×109824721² = 24122938685455682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (109824727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54912360 + 54912361.

It is an arithmetic number, because the mean of its divisors is an integer number (54912361).

Almost surely, 2^109824721 is an apocalyptic number.

It is an amenable number.

109824721 is a deficient number, since it is larger than the sum of its proper divisors (1).

109824721 is an equidigital number, since it uses as much as digits as its factorization.

109824721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 109824721 is about 10479.7290518410. The cubic root of 109824721 is about 478.8873548718.

The spelling of 109824721 in words is "one hundred nine million, eight hundred twenty-four thousand, seven hundred twenty-one".