2421265921 has 2 divisors, whose sum is σ = 2421265922. Its totient is φ = 2421265920.

The previous prime is 2421265909. The next prime is 2421265933. The reversal of 2421265921 is 1295621242.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (2421265909) and next prime (2421265933).

It can be written as a sum of positive squares in only one way, i.e., 2231239696 + 190026225 = 47236^2 + 13785^2 .

It is a cyclic number.

It is not a de Polignac number, because 2421265921 - 2¹⁹ = 2420741633 is a prime.

It is not a weakly prime, because it can be changed into another prime (2421265901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1210632960 + 1210632961.

It is an arithmetic number, because the mean of its divisors is an integer number (1210632961).

Almost surely, 2^2421265921 is an apocalyptic number.

It is an amenable number.

2421265921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2421265921 is an equidigital number, since it uses as much as digits as its factorization.

2421265921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 34.

The square root of 2421265921 is about 49206.3605746249. The cubic root of 2421265921 is about 1342.8087518955.

The spelling of 2421265921 in words is "two billion, four hundred twenty-one million, two hundred sixty-five thousand, nine hundred twenty-one".