24721139 has 2 divisors, whose sum is σ = 24721140. Its totient is φ = 24721138.

The previous prime is 24721127. The next prime is 24721157. The reversal of 24721139 is 93112742.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-24721139 is a prime.

It is a super-2 number, since 2×24721139² = 1222269426914642, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (24721199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12360569 + 12360570.

It is an arithmetic number, because the mean of its divisors is an integer number (12360570).

Almost surely, 2^24721139 is an apocalyptic number.

24721139 is a deficient number, since it is larger than the sum of its proper divisors (1).

24721139 is an equidigital number, since it uses as much as digits as its factorization.

24721139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 29.

The square root of 24721139 is about 4972.0356997914. The cubic root of 24721139 is about 291.3105135609.

The spelling of 24721139 in words is "twenty-four million, seven hundred twenty-one thousand, one hundred thirty-nine".