21134939644 has 48 divisors (see below), whose sum is σ = 46293004800. Its totient is φ = 8219353536.

The previous prime is 21134939593. The next prime is 21134939659. The reversal of 21134939644 is 44693943112.

It is a junction number, because it is equal to n+sod(n) for n = 21134939594 and 21134939603.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 470584 + ... + 513535.

It is an arithmetic number, because the mean of its divisors is an integer number (964437600).

Almost surely, 2^21134939644 is an apocalyptic number.

It is an amenable number.

21134939644 is an abundant number, since it is smaller than the sum of its proper divisors (25158065156).

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

21134939644 is a wasteful number, since it uses less digits than its factorization.

21134939644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 984202 (or 984200 counting only the distinct ones).

The product of its digits is 559872, while the sum is 46.

The spelling of 21134939644 in words is "twenty-one billion, one hundred thirty-four million, nine hundred thirty-nine thousand, six hundred forty-four".