2340021561 has 4 divisors (see below), whose sum is σ = 3120028752. Its totient is φ = 1560014372.

The previous prime is 2340021547. The next prime is 2340021569. The reversal of 2340021561 is 1651200432.

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 2340021561 - 2⁵ = 2340021529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2340021569) 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, 390003591 + ... + 390003596.

It is an arithmetic number, because the mean of its divisors is an integer number (780007188).

Almost surely, 2^2340021561 is an apocalyptic number.

It is an amenable number.

2340021561 is a deficient number, since it is larger than the sum of its proper divisors (780007191).

2340021561 is an equidigital number, since it uses as much as digits as its factorization.

2340021561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780007190.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 2340021561 is about 48373.7693486873. The cubic root of 2340021561 is about 1327.6184718410.

Adding to 2340021561 its reverse (1651200432), we get a palindrome (3991221993).

The spelling of 2340021561 in words is "two billion, three hundred forty million, twenty-one thousand, five hundred sixty-one".