21105213023014 has 4 divisors (see below), whose sum is σ = 31657819534524. Its totient is φ = 10552606511506.

The previous prime is 21105213022991. The next prime is 21105213023087. The reversal of 21105213023014 is 41032031250112.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21105213023014.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5276303255752 + ... + 5276303255755.

It is an arithmetic number, because the mean of its divisors is an integer number (7914454883631).

Almost surely, 2^{21105213023014} is an apocalyptic number.

21105213023014 is a deficient number, since it is larger than the sum of its proper divisors (10552606511510).

21105213023014 is a wasteful number, since it uses less digits than its factorization.

21105213023014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10552606511509.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 21105213023014 its reverse (41032031250112), we get a palindrome (62137244273126).

The spelling of 21105213023014 in words is "twenty-one trillion, one hundred five billion, two hundred thirteen million, twenty-three thousand, fourteen".