21453576067 has 20 divisors (see below), whose sum is σ = 27302960376. Its totient is φ = 16717051680.

The previous prime is 21453576043. The next prime is 21453576119. The reversal of 21453576067 is 76067535412.

It is not a de Polignac number, because 21453576067 - 2¹⁵ = 21453543299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21453571067) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 379738 + ... + 432559.

Almost surely, 2^21453576067 is an apocalyptic number.

21453576067 is a deficient number, since it is larger than the sum of its proper divisors (5849384309).

21453576067 is an frugal number, since it uses more digits than its factorization.

21453576067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812336 (or 812315 counting only the distinct ones).

The product of its (nonzero) digits is 1058400, while the sum is 46.

The spelling of 21453576067 in words is "twenty-one billion, four hundred fifty-three million, five hundred seventy-six thousand, sixty-seven".