21451572358 has 8 divisors (see below), whose sum is σ = 32193623880. Its totient is φ = 10720364400.

The previous prime is 21451572319. The next prime is 21451572371. The reversal of 21451572358 is 85327515412.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2705943 + ... + 2713858.

It is an arithmetic number, because the mean of its divisors is an integer number (4024202985).

Almost surely, 2^21451572358 is an apocalyptic number.

21451572358 is a deficient number, since it is larger than the sum of its proper divisors (10742051522).

21451572358 is a wasteful number, since it uses less digits than its factorization.

21451572358 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5421782.

The product of its digits is 336000, while the sum is 43.

The spelling of 21451572358 in words is "twenty-one billion, four hundred fifty-one million, five hundred seventy-two thousand, three hundred fifty-eight".