21340204401 has 16 divisors (see below), whose sum is σ = 28632951360. Its totient is φ = 14137244160.

The previous prime is 21340204387. The next prime is 21340204481. The reversal of 21340204401 is 10440204312.

It is not a de Polignac number, because 21340204401 - 2⁷ = 21340204273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21340204481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 781881 + ... + 808713.

It is an arithmetic number, because the mean of its divisors is an integer number (1789559460).

Almost surely, 2^21340204401 is an apocalyptic number.

It is an amenable number.

21340204401 is a deficient number, since it is larger than the sum of its proper divisors (7292746959).

21340204401 is a wasteful number, since it uses less digits than its factorization.

21340204401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28496.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21340204401 its reverse (10440204312), we get a palindrome (31780408713).

The spelling of 21340204401 in words is "twenty-one billion, three hundred forty million, two hundred four thousand, four hundred one".