21736952874 has 192 divisors, whose sum is σ = 58876097280. Its totient is φ = 5643509760.

The previous prime is 21736952791. The next prime is 21736952891. The reversal of 21736952874 is 47825963712.

It is a happy number.

21736952874 is a `hidden beast` number, since 2 + 17 + 36 + 9 + 528 + 74 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21736952874.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 37672074 + ... + 37672650.

It is an arithmetic number, because the mean of its divisors is an integer number (306646340).

Almost surely, 2^21736952874 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21736952874, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29438048640).

21736952874 is an abundant number, since it is smaller than the sum of its proper divisors (37139144406).

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

21736952874 is a wasteful number, since it uses less digits than its factorization.

21736952874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 925 (or 922 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 54.

The spelling of 21736952874 in words is "twenty-one billion, seven hundred thirty-six million, nine hundred fifty-two thousand, eight hundred seventy-four".