21230276664 has 16 divisors (see below), whose sum is σ = 53075691720. Its totient is φ = 7076758880.

The previous prime is 21230276663. The next prime is 21230276687. The reversal of 21230276664 is 46667203212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230276663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 442297407 + ... + 442297454.

Almost surely, 2^21230276664 is an apocalyptic number.

21230276664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21230276664 is an abundant number, since it is smaller than the sum of its proper divisors (31845415056).

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

21230276664 is a wasteful number, since it uses less digits than its factorization.

21230276664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 884594870 (or 884594866 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 39.

Adding to 21230276664 its reverse (46667203212), we get a palindrome (67897479876).

The spelling of 21230276664 in words is "twenty-one billion, two hundred thirty million, two hundred seventy-six thousand, six hundred sixty-four".