21145152146 has 8 divisors (see below), whose sum is σ = 31728610380. Its totient is φ = 10568948688.

The previous prime is 21145152137. The next prime is 21145152151. The reversal of 21145152146 is 64125154112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17758494121 + 3386658025 = 133261^2 + 58195^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 1806401 + ... + 1818068.

Almost surely, 2^21145152146 is an apocalyptic number.

21145152146 is a deficient number, since it is larger than the sum of its proper divisors (10583458234).

21145152146 is a wasteful number, since it uses less digits than its factorization.

21145152146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3627388.

The product of its digits is 9600, while the sum is 32.

The spelling of 21145152146 in words is "twenty-one billion, one hundred forty-five million, one hundred fifty-two thousand, one hundred forty-six".