21649003276 has 24 divisors (see below), whose sum is σ = 39798309600. Its totient is φ = 10284375552.

The previous prime is 21649003157. The next prime is 21649003283. The reversal of 21649003276 is 67230094612.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 775941 + ... + 803356.

It is an arithmetic number, because the mean of its divisors is an integer number (1658262900).

Almost surely, 2^21649003276 is an apocalyptic number.

It is an amenable number.

21649003276 is a deficient number, since it is larger than the sum of its proper divisors (18149306324).

21649003276 is a wasteful number, since it uses less digits than its factorization.

21649003276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1579473 (or 1579471 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 40.

Adding to 21649003276 its reverse (67230094612), we get a palindrome (88879097888).

The spelling of 21649003276 in words is "twenty-one billion, six hundred forty-nine million, three thousand, two hundred seventy-six".