21204771814 has 8 divisors (see below), whose sum is σ = 31891082760. Its totient is φ = 10574410896.

The previous prime is 21204771811. The next prime is 21204771821. The reversal of 21204771814 is 41817740212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21204771811) 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, 13986559 + ... + 13988074.

It is an arithmetic number, because the mean of its divisors is an integer number (3986385345).

Almost surely, 2^21204771814 is an apocalyptic number.

21204771814 is a deficient number, since it is larger than the sum of its proper divisors (10686310946).

21204771814 is a wasteful number, since it uses less digits than its factorization.

21204771814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27975014.

The product of its (nonzero) digits is 25088, while the sum is 37.

The spelling of 21204771814 in words is "twenty-one billion, two hundred four million, seven hundred seventy-one thousand, eight hundred fourteen".