2305121921 has 2 divisors, whose sum is σ = 2305121922. Its totient is φ = 2305121920.

The previous prime is 2305121911. The next prime is 2305121947. The reversal of 2305121921 is 1291215032.

It is a happy number.

It is an a-pointer prime, because the next prime (2305121947) can be obtained adding 2305121921 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2282928400 + 22193521 = 47780^2 + 4711^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2305121921 is a prime.

It is not a weakly prime, because it can be changed into another prime (2305121911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1152560960 + 1152560961.

It is an arithmetic number, because the mean of its divisors is an integer number (1152560961).

Almost surely, 2^2305121921 is an apocalyptic number.

It is an amenable number.

2305121921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2305121921 is an equidigital number, since it uses as much as digits as its factorization.

2305121921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 2305121921 is about 48011.6852547377. The cubic root of 2305121921 is about 1320.9852456451.

Adding to 2305121921 its reverse (1291215032), we get a palindrome (3596336953).

The spelling of 2305121921 in words is "two billion, three hundred five million, one hundred twenty-one thousand, nine hundred twenty-one".