21226535677 has 4 divisors (see below), whose sum is σ = 21227787616. Its totient is φ = 21225283740.

The previous prime is 21226535647. The next prime is 21226535731. The reversal of 21226535677 is 77653562212.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21226535677 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 (21226535647) 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, 600183 + ... + 634564.

It is an arithmetic number, because the mean of its divisors is an integer number (5306946904).

Almost surely, 2^21226535677 is an apocalyptic number.

It is an amenable number.

21226535677 is a deficient number, since it is larger than the sum of its proper divisors (1251939).

21226535677 is a wasteful number, since it uses less digits than its factorization.

21226535677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1251938.

The product of its digits is 1058400, while the sum is 46.

The spelling of 21226535677 in words is "twenty-one billion, two hundred twenty-six million, five hundred thirty-five thousand, six hundred seventy-seven".