21393628948 has 24 divisors (see below), whose sum is σ = 38358832680. Its totient is φ = 10434055680.

The previous prime is 21393628913. The next prime is 21393628957. The reversal of 21393628948 is 84982639312.

It can be written as a sum of positive squares in 4 ways, for example, as 6906384 + 21386722564 = 2628^2 + 146242^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1540098 + ... + 1553926.

It is an arithmetic number, because the mean of its divisors is an integer number (1598284695).

Almost surely, 2^21393628948 is an apocalyptic number.

It is an amenable number.

21393628948 is a deficient number, since it is larger than the sum of its proper divisors (16965203732).

21393628948 is a wasteful number, since it uses less digits than its factorization.

21393628948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23307 (or 23305 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 55.

The spelling of 21393628948 in words is "twenty-one billion, three hundred ninety-three million, six hundred twenty-eight thousand, nine hundred forty-eight".