2351440021 has 8 divisors (see below), whose sum is σ = 2759991680. Its totient is φ = 1961046288.

The previous prime is 2351440009. The next prime is 2351440027. The reversal of 2351440021 is 1200441532.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2351440021 - 2⁵ = 2351439989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2351439974 and 2351440001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2351440027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4539201 + ... + 4539718.

It is an arithmetic number, because the mean of its divisors is an integer number (344998960).

Almost surely, 2^2351440021 is an apocalyptic number.

It is an amenable number.

2351440021 is a deficient number, since it is larger than the sum of its proper divisors (408551659).

2351440021 is an equidigital number, since it uses as much as digits as its factorization.

2351440021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9078963.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 2351440021 is about 48491.6489820670. The cubic root of 2351440021 is about 1329.7744017831.

Adding to 2351440021 its reverse (1200441532), we get a palindrome (3551881553).

The spelling of 2351440021 in words is "two billion, three hundred fifty-one million, four hundred forty thousand, twenty-one".