21354246066 has 32 divisors (see below), whose sum is σ = 43657542720. Its totient is φ = 6961158144.

The previous prime is 21354246049. The next prime is 21354246103. The reversal of 21354246066 is 66064245312.

It is a Curzon number.

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 15 ways as a sum of consecutive naturals, for example, 87955 + ... + 224598.

It is an arithmetic number, because the mean of its divisors is an integer number (1364298210).

Almost surely, 2^21354246066 is an apocalyptic number.

21354246066 is an abundant number, since it is smaller than the sum of its proper divisors (22303296654).

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

21354246066 is a wasteful number, since it uses less digits than its factorization.

21354246066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312810.

The product of its (nonzero) digits is 207360, while the sum is 39.

The spelling of 21354246066 in words is "twenty-one billion, three hundred fifty-four million, two hundred forty-six thousand, sixty-six".