21366213731226 has 96 divisors (see below), whose sum is σ = 57663035015040. Its totient is φ = 5567153231232.

The previous prime is 21366213731179. The next prime is 21366213731237. The reversal of 21366213731226 is 62213731266312.

It is a happy number.

21366213731226 is a `hidden beast` number, since 2 + 1 + 3 + 6 + 621 + 3 + 7 + 3 + 12 + 2 + 6 = 666.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 78442881 + ... + 78714788.

It is an arithmetic number, because the mean of its divisors is an integer number (600656614740).

Almost surely, 2^{21366213731226} is an apocalyptic number.

21366213731226 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21366213731226 is an abundant number, since it is smaller than the sum of its proper divisors (36296821283814).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21366213731226 is a wasteful number, since it uses less digits than its factorization.

21366213731226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157157780 (or 157157777 counting only the distinct ones).

The product of its digits is 653184, while the sum is 45.

Adding to 21366213731226 its reverse (62213731266312), we get a palindrome (83579944997538).

The spelling of 21366213731226 in words is "twenty-one trillion, three hundred sixty-six billion, two hundred thirteen million, seven hundred thirty-one thousand, two hundred twenty-six".