21145306466 has 8 divisors (see below), whose sum is σ = 31719437904. Its totient is φ = 10572160500.

The previous prime is 21145306447. The next prime is 21145306577. The reversal of 21145306466 is 66460354112.

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

It is a super-2 number, since 2×21145306466² (a number of 21 digits) contains 22 as substring.

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, 190160 + ... + 280091.

It is an arithmetic number, because the mean of its divisors is an integer number (3964929738).

Almost surely, 2^21145306466 is an apocalyptic number.

21145306466 is a deficient number, since it is larger than the sum of its proper divisors (10574131438).

21145306466 is a wasteful number, since it uses less digits than its factorization.

21145306466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492736.

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 21145306466 in words is "twenty-one billion, one hundred forty-five million, three hundred six thousand, four hundred sixty-six".