21134210277 has 4 divisors (see below), whose sum is σ = 28178947040. Its totient is φ = 14089473516.

The previous prime is 21134210269. The next prime is 21134210281. The reversal of 21134210277 is 77201243112.

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 not a de Polignac number, because 21134210277 - 2³ = 21134210269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21134210257) 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, 3522368377 + ... + 3522368382.

It is an arithmetic number, because the mean of its divisors is an integer number (7044736760).

Almost surely, 2^21134210277 is an apocalyptic number.

It is an amenable number.

21134210277 is a deficient number, since it is larger than the sum of its proper divisors (7044736763).

21134210277 is an equidigital number, since it uses as much as digits as its factorization.

21134210277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7044736762.

The product of its (nonzero) digits is 4704, while the sum is 30.

Adding to 21134210277 its reverse (77201243112), we get a palindrome (98335453389).

The spelling of 21134210277 in words is "twenty-one billion, one hundred thirty-four million, two hundred ten thousand, two hundred seventy-seven".