21545011000442 has 8 divisors (see below), whose sum is σ = 32374114604832. Its totient is φ = 10753639465500.

The previous prime is 21545011000427. The next prime is 21545011000481. The reversal of 21545011000442 is 24400011054512.

It is a happy number.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9433015934 + ... + 9433018217.

It is an arithmetic number, because the mean of its divisors is an integer number (4046764325604).

Almost surely, 2^{21545011000442} is an apocalyptic number.

21545011000442 is a deficient number, since it is larger than the sum of its proper divisors (10829103604390).

21545011000442 is a wasteful number, since it uses less digits than its factorization.

21545011000442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18866034724.

The product of its (nonzero) digits is 6400, while the sum is 29.

Adding to 21545011000442 its reverse (24400011054512), we get a palindrome (45945022054954).

The spelling of 21545011000442 in words is "twenty-one trillion, five hundred forty-five billion, eleven million, four hundred forty-two", and thus it is an aban number.