21404534555 has 16 divisors (see below), whose sum is σ = 26234914080. Its totient is φ = 16760570112.

The previous prime is 21404534537. The next prime is 21404534561. The reversal of 21404534555 is 55543540412.

It is a cyclic number.

It is not a de Polignac number, because 21404534555 - 2¹⁴ = 21404518171 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 150890 + ... + 256079.

It is an arithmetic number, because the mean of its divisors is an integer number (1639682130).

Almost surely, 2^21404534555 is an apocalyptic number.

21404534555 is a deficient number, since it is larger than the sum of its proper divisors (4830379525).

21404534555 is a wasteful number, since it uses less digits than its factorization.

21404534555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407198.

The product of its (nonzero) digits is 240000, while the sum is 38.

The spelling of 21404534555 in words is "twenty-one billion, four hundred four million, five hundred thirty-four thousand, five hundred fifty-five".