21134826774 has 16 divisors (see below), whose sum is σ = 46966281840. Its totient is φ = 7044942240.

The previous prime is 21134826773. The next prime is 21134826827. The reversal of 21134826774 is 47762843112.

21134826774 is a `hidden beast` number, since 211 + 348 + 26 + 7 + 74 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21134826773) 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, 195692787 + ... + 195692894.

It is an arithmetic number, because the mean of its divisors is an integer number (2935392615).

Almost surely, 2^21134826774 is an apocalyptic number.

21134826774 is an abundant number, since it is smaller than the sum of its proper divisors (25831455066).

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

21134826774 is a wasteful number, since it uses less digits than its factorization.

21134826774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391385692 (or 391385686 counting only the distinct ones).

The product of its digits is 451584, while the sum is 45.

The spelling of 21134826774 in words is "twenty-one billion, one hundred thirty-four million, eight hundred twenty-six thousand, seven hundred seventy-four".