21277347455 has 16 divisors (see below), whose sum is σ = 31425006144. Its totient is φ = 13467859200.

The previous prime is 21277347439. The next prime is 21277347479. The reversal of 21277347455 is 55474377212.

It is not a de Polignac number, because 21277347455 - 2⁴ = 21277347439 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

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, 23381246 + ... + 23382155.

It is an arithmetic number, because the mean of its divisors is an integer number (1964062884).

Almost surely, 2^21277347455 is an apocalyptic number.

21277347455 is a deficient number, since it is larger than the sum of its proper divisors (10147658689).

21277347455 is a wasteful number, since it uses less digits than its factorization.

21277347455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46763426.

The product of its digits is 1646400, while the sum is 47.

The spelling of 21277347455 in words is "twenty-one billion, two hundred seventy-seven million, three hundred forty-seven thousand, four hundred fifty-five".