21623005521227 has 4 divisors (see below), whose sum is σ = 23588733295896. Its totient is φ = 19657277746560.

The previous prime is 21623005521191. The next prime is 21623005521239. The reversal of 21623005521227 is 72212550032612.

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 21623005521227 - 2¹⁴ = 21623005504843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21623005541227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 982863887318 + ... + 982863887339.

It is an arithmetic number, because the mean of its divisors is an integer number (5897183323974).

Almost surely, 2^{21623005521227} is an apocalyptic number.

21623005521227 is a deficient number, since it is larger than the sum of its proper divisors (1965727774669).

21623005521227 is a wasteful number, since it uses less digits than its factorization.

21623005521227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1965727774668.

The product of its (nonzero) digits is 100800, while the sum is 38.

Adding to 21623005521227 its reverse (72212550032612), we get a palindrome (93835555553839).

The spelling of 21623005521227 in words is "twenty-one trillion, six hundred twenty-three billion, five million, five hundred twenty-one thousand, two hundred twenty-seven".