21045452346 has 16 divisors (see below), whose sum is σ = 46767672000. Its totient is φ = 7015150764.

The previous prime is 21045452327. The next prime is 21045452347. The reversal of 21045452346 is 64325454012.

21045452346 is a `hidden beast` number, since 2 + 104 + 545 + 2 + 3 + 4 + 6 = 666.

It is a super-2 number, since 2×21045452346² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21045452346.

It is not an unprimeable number, because it can be changed into a prime (21045452347) by changing a digit.

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, 194865246 + ... + 194865353.

It is an arithmetic number, because the mean of its divisors is an integer number (2922979500).

Almost surely, 2^21045452346 is an apocalyptic number.

21045452346 is an abundant number, since it is smaller than the sum of its proper divisors (25722219654).

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

21045452346 is a wasteful number, since it uses less digits than its factorization.

21045452346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389730610 (or 389730604 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

The spelling of 21045452346 in words is "twenty-one billion, forty-five million, four hundred fifty-two thousand, three hundred forty-six".