21226877767 has 12 divisors (see below), whose sum is σ = 23357813080. Its totient is φ = 19235330928.

The previous prime is 21226877761. The next prime is 21226877779. The reversal of 21226877767 is 76777862212.

It is not a de Polignac number, because 21226877767 - 2¹⁵ = 21226844999 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 (21226877761) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1045908 + ... + 1066009.

Almost surely, 2^21226877767 is an apocalyptic number.

21226877767 is a deficient number, since it is larger than the sum of its proper divisors (2130935313).

21226877767 is a wasteful number, since it uses less digits than its factorization.

21226877767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2111982 (or 2111959 counting only the distinct ones).

The product of its digits is 5531904, while the sum is 55.

The spelling of 21226877767 in words is "twenty-one billion, two hundred twenty-six million, eight hundred seventy-seven thousand, seven hundred sixty-seven".