21106326455 has 8 divisors (see below), whose sum is σ = 26817450192. Its totient is φ = 15891822208.

The previous prime is 21106326427. The next prime is 21106326503. The reversal of 21106326455 is 55462360112.

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 21106326455 - 2¹² = 21106322359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124154777 + ... + 124154946.

It is an arithmetic number, because the mean of its divisors is an integer number (3352181274).

Almost surely, 2^21106326455 is an apocalyptic number.

21106326455 is a deficient number, since it is larger than the sum of its proper divisors (5711123737).

21106326455 is a wasteful number, since it uses less digits than its factorization.

21106326455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248309745.

The product of its (nonzero) digits is 43200, while the sum is 35.

Adding to 21106326455 its reverse (55462360112), we get a palindrome (76568686567).

The spelling of 21106326455 in words is "twenty-one billion, one hundred six million, three hundred twenty-six thousand, four hundred fifty-five".