21704452254 has 16 divisors (see below), whose sum is σ = 48232116240. Its totient is φ = 7234817400.

The previous prime is 21704452243. The next prime is 21704452309. The reversal of 21704452254 is 45225440712.

21704452254 is a `hidden beast` number, since 21 + 70 + 44 + 522 + 5 + 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 an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200967097 + ... + 200967204.

It is an arithmetic number, because the mean of its divisors is an integer number (3014507265).

Almost surely, 2^21704452254 is an apocalyptic number.

21704452254 is an abundant number, since it is smaller than the sum of its proper divisors (26527663986).

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

21704452254 is a wasteful number, since it uses less digits than its factorization.

21704452254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401934312 (or 401934306 counting only the distinct ones).

The product of its (nonzero) digits is 89600, while the sum is 36.

Adding to 21704452254 its reverse (45225440712), we get a palindrome (66929892966).

The spelling of 21704452254 in words is "twenty-one billion, seven hundred four million, four hundred fifty-two thousand, two hundred fifty-four".