21205621067714 has 16 divisors (see below), whose sum is σ = 32683594369536. Its totient is φ = 10311361110000.

The previous prime is 21205621067711. The next prime is 21205621067753. The reversal of 21205621067714 is 41776012650212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21205621067711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67717412 + ... + 68029839.

It is an arithmetic number, because the mean of its divisors is an integer number (2042724648096).

Almost surely, 2^{21205621067714} is an apocalyptic number.

21205621067714 is a deficient number, since it is larger than the sum of its proper divisors (11477973301822).

21205621067714 is a wasteful number, since it uses less digits than its factorization.

21205621067714 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135749401.

The product of its (nonzero) digits is 282240, while the sum is 44.

The spelling of 21205621067714 in words is "twenty-one trillion, two hundred five billion, six hundred twenty-one million, sixty-seven thousand, seven hundred fourteen".