21106515227 has 4 divisors (see below), whose sum is σ = 24121731696. Its totient is φ = 18091298760.

The previous prime is 21106515211. The next prime is 21106515251. The reversal of 21106515227 is 72251560112.

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

It is a cyclic number.

It is not a de Polignac number, because 21106515227 - 2⁴ = 21106515211 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21106515193 and 21106515202.

It is not an unprimeable number, because it can be changed into a prime (21106515827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1507608224 + ... + 1507608237.

It is an arithmetic number, because the mean of its divisors is an integer number (6030432924).

Almost surely, 2^21106515227 is an apocalyptic number.

21106515227 is a deficient number, since it is larger than the sum of its proper divisors (3015216469).

21106515227 is an equidigital number, since it uses as much as digits as its factorization.

21106515227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3015216468.

The product of its (nonzero) digits is 8400, while the sum is 32.

The spelling of 21106515227 in words is "twenty-one billion, one hundred six million, five hundred fifteen thousand, two hundred twenty-seven".