1240021313 has 4 divisors (see below), whose sum is σ = 1240266288. Its totient is φ = 1239776340.

The previous prime is 1240021291. The next prime is 1240021331. The reversal of 1240021313 is 3131200421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1240021313 - 2⁶ = 1240021249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1240021291 and 1240021300.

It is not an unprimeable number, because it can be changed into a prime (1240021213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114731 + ... + 125072.

It is an arithmetic number, because the mean of its divisors is an integer number (310066572).

Almost surely, 2^1240021313 is an apocalyptic number.

It is an amenable number.

1240021313 is a deficient number, since it is larger than the sum of its proper divisors (244975).

1240021313 is an equidigital number, since it uses as much as digits as its factorization.

1240021313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244974.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1240021313 is about 35213.9363462820. The cubic root of 1240021313 is about 1074.3432261542.

Adding to 1240021313 its reverse (3131200421), we get a palindrome (4371221734).

The spelling of 1240021313 in words is "one billion, two hundred forty million, twenty-one thousand, three hundred thirteen".