2121090464 has 24 divisors (see below), whose sum is σ = 4218953508. Its totient is φ = 1049610240.

The previous prime is 2121090457. The next prime is 2121090467. The reversal of 2121090464 is 4640901212.

It can be written as a sum of positive squares in 2 ways, for example, as 1785907600 + 335182864 = 42260^2 + 18308^2 .

It is not an unprimeable number, because it can be changed into a prime (2121090467) 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, 338567 + ... + 344774.

Almost surely, 2^2121090464 is an apocalyptic number.

It is an amenable number.

2121090464 is a deficient number, since it is larger than the sum of its proper divisors (2097863044).

2121090464 is an equidigital number, since it uses as much as digits as its factorization.

2121090464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683448 (or 683440 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 2121090464 is about 46055.2978928592. The cubic root of 2121090464 is about 1284.8518785396.

Adding to 2121090464 its reverse (4640901212), we get a palindrome (6761991676).

The spelling of 2121090464 in words is "two billion, one hundred twenty-one million, ninety thousand, four hundred sixty-four".