21412347277 has 8 divisors (see below), whose sum is σ = 21632153400. Its totient is φ = 21192966144.

The previous prime is 21412347269. The next prime is 21412347289. The reversal of 21412347277 is 77274321412.

It can be written as a sum of positive squares in 4 ways, for example, as 187936681 + 21224410596 = 13709^2 + 145686^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21412347277 - 2³ = 21412347269 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 (21412347377) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4468 + ... + 206989.

It is an arithmetic number, because the mean of its divisors is an integer number (2704019175).

Almost surely, 2^21412347277 is an apocalyptic number.

It is an amenable number.

21412347277 is a deficient number, since it is larger than the sum of its proper divisors (219806123).

21412347277 is a wasteful number, since it uses less digits than its factorization.

21412347277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212495.

The product of its digits is 131712, while the sum is 40.

Adding to 21412347277 its reverse (77274321412), we get a palindrome (98686668689).

The spelling of 21412347277 in words is "twenty-one billion, four hundred twelve million, three hundred forty-seven thousand, two hundred seventy-seven".