21132664534 has 4 divisors (see below), whose sum is σ = 31698996804. Its totient is φ = 10566332266.

The previous prime is 21132664513. The next prime is 21132664543. The reversal of 21132664534 is 43546623112.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21132664493 and 21132664502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5283166132 + ... + 5283166135.

It is an arithmetic number, because the mean of its divisors is an integer number (7924749201).

Almost surely, 2^21132664534 is an apocalyptic number.

21132664534 is a deficient number, since it is larger than the sum of its proper divisors (10566332270).

21132664534 is a wasteful number, since it uses less digits than its factorization.

21132664534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10566332269.

The product of its digits is 103680, while the sum is 37.

The spelling of 21132664534 in words is "twenty-one billion, one hundred thirty-two million, six hundred sixty-four thousand, five hundred thirty-four".