21001323848 has 8 divisors (see below), whose sum is σ = 39377482230. Its totient is φ = 10500661920.

The previous prime is 21001323841. The next prime is 21001323853. The reversal of 21001323848 is 84832310012.

It can be written as a sum of positive squares in only one way, i.e., 11785707844 + 9215616004 = 108562^2 + 95998^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (21001323841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1312582733 + ... + 1312582748.

Almost surely, 2^21001323848 is an apocalyptic number.

It is an amenable number.

21001323848 is a deficient number, since it is larger than the sum of its proper divisors (18376158382).

21001323848 is a wasteful number, since it uses less digits than its factorization.

21001323848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2625165487 (or 2625165483 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The spelling of 21001323848 in words is "twenty-one billion, one million, three hundred twenty-three thousand, eight hundred forty-eight".