21320450446866 has 16 divisors (see below), whose sum is σ = 42641478812064. Its totient is φ = 7106720495904.

The previous prime is 21320450446849. The next prime is 21320450446937. The reversal of 21320450446866 is 66864405402312.

It is a happy 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 7 ways as a sum of consecutive naturals, for example, 23599600 + ... + 24486363.

It is an arithmetic number, because the mean of its divisors is an integer number (2665092425754).

Almost surely, 2^{21320450446866} is an apocalyptic number.

21320450446866 is an abundant number, since it is smaller than the sum of its proper divisors (21321028365198).

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

21320450446866 is a wasteful number, since it uses less digits than its factorization.

21320450446866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48159865.

The product of its (nonzero) digits is 6635520, while the sum is 51.

The spelling of 21320450446866 in words is "twenty-one trillion, three hundred twenty billion, four hundred fifty million, four hundred forty-six thousand, eight hundred sixty-six".