2121400465 has 16 divisors (see below), whose sum is σ = 2573778240. Its totient is φ = 1678427200.

The previous prime is 2121400451. The next prime is 2121400517. The reversal of 2121400465 is 5640041212.

It is a happy number.

It is not a de Polignac number, because 2121400465 - 2⁵ = 2121400433 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 597666 + ... + 601204.

It is an arithmetic number, because the mean of its divisors is an integer number (160861140).

Almost surely, 2^2121400465 is an apocalyptic number.

It is an amenable number.

2121400465 is a deficient number, since it is larger than the sum of its proper divisors (452377775).

2121400465 is a wasteful number, since it uses less digits than its factorization.

2121400465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4832.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 2121400465 is about 46058.6633001871. The cubic root of 2121400465 is about 1284.9144699238.

Adding to 2121400465 its reverse (5640041212), we get a palindrome (7761441677).

The spelling of 2121400465 in words is "two billion, one hundred twenty-one million, four hundred thousand, four hundred sixty-five".