2121500405 has 8 divisors (see below), whose sum is σ = 2546737152. Its totient is φ = 1696575888.

The previous prime is 2121500401. The next prime is 2121500411. The reversal of 2121500405 is 5040051212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2121500405 - 2² = 2121500401 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121500401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62837 + ... + 90506.

It is an arithmetic number, because the mean of its divisors is an integer number (318342144).

Almost surely, 2^2121500405 is an apocalyptic number.

It is an amenable number.

2121500405 is a deficient number, since it is larger than the sum of its proper divisors (425236747).

2121500405 is a wasteful number, since it uses less digits than its factorization.

2121500405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156115.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 2121500405 is about 46059.7482081698. The cubic root of 2121500405 is about 1284.9346472136.

Adding to 2121500405 its reverse (5040051212), we get a palindrome (7161551617).

The spelling of 2121500405 in words is "two billion, one hundred twenty-one million, five hundred thousand, four hundred five".