21114801774 has 72 divisors (see below), whose sum is σ = 50547356496. Its totient is φ = 6365145600.

The previous prime is 21114801767. The next prime is 21114801779. The reversal of 21114801774 is 47710841112.

21114801774 is a `hidden beast` number, since 2 + 1 + 1 + 1 + 480 + 177 + 4 = 666.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21114801779) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 395239 + ... + 445469.

It is an arithmetic number, because the mean of its divisors is an integer number (702046618).

Almost surely, 2^21114801774 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21114801774, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25273678248).

21114801774 is an abundant number, since it is smaller than the sum of its proper divisors (29432554722).

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

21114801774 is a wasteful number, since it uses less digits than its factorization.

21114801774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50454 (or 50440 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 36.

The spelling of 21114801774 in words is "twenty-one billion, one hundred fourteen million, eight hundred one thousand, seven hundred seventy-four".