240021013 has 2 divisors, whose sum is σ = 240021014. Its totient is φ = 240021012.

The previous prime is 240020999. The next prime is 240021043. The reversal of 240021013 is 310120042.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 185586129 + 54434884 = 13623^2 + 7378^2 .

It is a cyclic number.

It is not a de Polignac number, because 240021013 - 2⁵ = 240020981 is a prime.

It is a super-2 number, since 2×240021013² = 115220173363092338, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 240020984 and 240021002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (240021043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120010506 + 120010507.

It is an arithmetic number, because the mean of its divisors is an integer number (120010507).

Almost surely, 2^240021013 is an apocalyptic number.

It is an amenable number.

240021013 is a deficient number, since it is larger than the sum of its proper divisors (1).

240021013 is an equidigital number, since it uses as much as digits as its factorization.

240021013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 240021013 is about 15492.6115616445. The cubic root of 240021013 is about 621.4646374050.

Adding to 240021013 its reverse (310120042), we get a palindrome (550141055).

The spelling of 240021013 in words is "two hundred forty million, twenty-one thousand, thirteen".