2121640236403 has 8 divisors (see below), whose sum is σ = 2140017614240. Its totient is φ = 2103324425280.

The previous prime is 2121640236389. The next prime is 2121640236409. The reversal of 2121640236403 is 3046320461212.

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 2121640236403 - 2¹⁷ = 2121640105331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121640236409) 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, 15322458 + ... + 15460303.

It is an arithmetic number, because the mean of its divisors is an integer number (267502201780).

Almost surely, 2^{2121640236403} is an apocalyptic number.

2121640236403 is a deficient number, since it is larger than the sum of its proper divisors (18377377837).

2121640236403 is a wasteful number, since it uses less digits than its factorization.

2121640236403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30783357.

The product of its (nonzero) digits is 41472, while the sum is 34.

Adding to 2121640236403 its reverse (3046320461212), we get a palindrome (5167960697615).

The spelling of 2121640236403 in words is "two trillion, one hundred twenty-one billion, six hundred forty million, two hundred thirty-six thousand, four hundred three".