21106511464 has 16 divisors (see below), whose sum is σ = 40416724800. Its totient is φ = 10328718192.

The previous prime is 21106511443. The next prime is 21106511473. The reversal of 21106511464 is 46411560112.

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, 28066794 + ... + 28067545.

It is an arithmetic number, because the mean of its divisors is an integer number (2526045300).

Almost surely, 2^21106511464 is an apocalyptic number.

It is an amenable number.

21106511464 is a deficient number, since it is larger than the sum of its proper divisors (19310213336).

21106511464 is a wasteful number, since it uses less digits than its factorization.

21106511464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56134392 (or 56134388 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The spelling of 21106511464 in words is "twenty-one billion, one hundred six million, five hundred eleven thousand, four hundred sixty-four".