21812747546 has 8 divisors (see below), whose sum is σ = 32720004000. Its totient is φ = 10906079548.

The previous prime is 21812747533. The next prime is 21812747609. The reversal of 21812747546 is 64574721812.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21812747546.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38366 + ... + 212361.

It is an arithmetic number, because the mean of its divisors is an integer number (4090000500).

Almost surely, 2^21812747546 is an apocalyptic number.

21812747546 is a deficient number, since it is larger than the sum of its proper divisors (10907256454).

21812747546 is a wasteful number, since it uses less digits than its factorization.

21812747546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294228.

The product of its digits is 752640, while the sum is 47.

The spelling of 21812747546 in words is "twenty-one billion, eight hundred twelve million, seven hundred forty-seven thousand, five hundred forty-six".