21383866726 has 4 divisors (see below), whose sum is σ = 32075800092. Its totient is φ = 10691933362.

The previous prime is 21383866697. The next prime is 21383866727. The reversal of 21383866726 is 62766838312.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21383866727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5345966680 + ... + 5345966683.

It is an arithmetic number, because the mean of its divisors is an integer number (8018950023).

Almost surely, 2^21383866726 is an apocalyptic number.

21383866726 is a deficient number, since it is larger than the sum of its proper divisors (10691933366).

21383866726 is a wasteful number, since it uses less digits than its factorization.

21383866726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10691933365.

The product of its digits is 3483648, while the sum is 52.

The spelling of 21383866726 in words is "twenty-one billion, three hundred eighty-three million, eight hundred sixty-six thousand, seven hundred twenty-six".