21060243623 has 4 divisors (see below), whose sum is σ = 21147630768. Its totient is φ = 20972856480.

The previous prime is 21060243619. The next prime is 21060243629. The reversal of 21060243623 is 32634206012.

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 21060243623 - 2² = 21060243619 is a prime.

It is a super-2 number, since 2×21060243623² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21060243629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43693211 + ... + 43693692.

It is an arithmetic number, because the mean of its divisors is an integer number (5286907692).

Almost surely, 2^21060243623 is an apocalyptic number.

21060243623 is a deficient number, since it is larger than the sum of its proper divisors (87387145).

21060243623 is an equidigital number, since it uses as much as digits as its factorization.

21060243623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87387144.

The product of its (nonzero) digits is 10368, while the sum is 29.

Adding to 21060243623 its reverse (32634206012), we get a palindrome (53694449635).

The spelling of 21060243623 in words is "twenty-one billion, sixty million, two hundred forty-three thousand, six hundred twenty-three".