21145985266 has 8 divisors (see below), whose sum is σ = 36250260480. Its totient is φ = 9062565108.

The previous prime is 21145985251. The next prime is 21145985293. The reversal of 21145985266 is 66258954112.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 755213746 + ... + 755213773.

It is an arithmetic number, because the mean of its divisors is an integer number (4531282560).

Almost surely, 2^21145985266 is an apocalyptic number.

21145985266 is a deficient number, since it is larger than the sum of its proper divisors (15104275214).

21145985266 is a wasteful number, since it uses less digits than its factorization.

21145985266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1510427528.

The product of its digits is 1036800, while the sum is 49.

The spelling of 21145985266 in words is "twenty-one billion, one hundred forty-five million, nine hundred eighty-five thousand, two hundred sixty-six".