21477796711 has 4 divisors (see below), whose sum is σ = 24546053392. Its totient is φ = 18409540032.

The previous prime is 21477796657. The next prime is 21477796729. The reversal of 21477796711 is 11769777412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21477796711 - 2⁹ = 21477796199 is a prime.

It is a super-2 number, since 2×21477796711² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21477796771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1534128330 + ... + 1534128343.

It is an arithmetic number, because the mean of its divisors is an integer number (6136513348).

Almost surely, 2^21477796711 is an apocalyptic number.

21477796711 is a deficient number, since it is larger than the sum of its proper divisors (3068256681).

21477796711 is an equidigital number, since it uses as much as digits as its factorization.

21477796711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3068256680.

The product of its digits is 1037232, while the sum is 52.

The spelling of 21477796711 in words is "twenty-one billion, four hundred seventy-seven million, seven hundred ninety-six thousand, seven hundred eleven".