21205354014 has 40 divisors (see below), whose sum is σ = 51170759640. Its totient is φ = 6524723664.

The previous prime is 21205354013. The next prime is 21205354033. The reversal of 21205354014 is 41045350212.

21205354014 is a `hidden beast` number, since 2 + 120 + 535 + 4 + 0 + 1 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21205354013) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5032404 + ... + 5036615.

It is an arithmetic number, because the mean of its divisors is an integer number (1279268991).

Almost surely, 2^21205354014 is an apocalyptic number.

21205354014 is an abundant number, since it is smaller than the sum of its proper divisors (29965405626).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21205354014 is a wasteful number, since it uses less digits than its factorization.

21205354014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10069046 (or 10069037 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The spelling of 21205354014 in words is "twenty-one billion, two hundred five million, three hundred fifty-four thousand, fourteen".