21404534401 has 4 divisors (see below), whose sum is σ = 21505977904. Its totient is φ = 21303090900.

The previous prime is 21404534353. The next prime is 21404534419. The reversal of 21404534401 is 10443540412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21404534401 - 2⁷ = 21404534273 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21404534401.

It is not an unprimeable number, because it can be changed into a prime (21404534461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50721435 + ... + 50721856.

It is an arithmetic number, because the mean of its divisors is an integer number (5376494476).

Almost surely, 2^21404534401 is an apocalyptic number.

It is an amenable number.

21404534401 is a deficient number, since it is larger than the sum of its proper divisors (101443503).

21404534401 is a wasteful number, since it uses less digits than its factorization.

21404534401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101443502.

The product of its (nonzero) digits is 7680, while the sum is 28.

The spelling of 21404534401 in words is "twenty-one billion, four hundred four million, five hundred thirty-four thousand, four hundred one".