21755421445066 has 8 divisors (see below), whose sum is σ = 32633163390240. Its totient is φ = 10877700314988.

The previous prime is 21755421445013. The next prime is 21755421445157. The reversal of 21755421445066 is 66054412455712.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2257126 + ... + 6971761.

It is an arithmetic number, because the mean of its divisors is an integer number (4079145423780).

Almost surely, 2^{21755421445066} is an apocalyptic number.

21755421445066 is a deficient number, since it is larger than the sum of its proper divisors (10877741945174).

21755421445066 is a wasteful number, since it uses less digits than its factorization.

21755421445066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10407548.

The product of its (nonzero) digits is 8064000, while the sum is 52.

The spelling of 21755421445066 in words is "twenty-one trillion, seven hundred fifty-five billion, four hundred twenty-one million, four hundred forty-five thousand, sixty-six".