21248669524 has 6 divisors (see below), whose sum is σ = 37185171674. Its totient is φ = 10624334760.

The previous prime is 21248669501. The next prime is 21248669537. The reversal of 21248669524 is 42596684212.

It can be written as a sum of positive squares in only one way, i.e., 20055657924 + 1193011600 = 141618^2 + 34540^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2656083687 + ... + 2656083694.

Almost surely, 2^21248669524 is an apocalyptic number.

It is an amenable number.

21248669524 is a deficient number, since it is larger than the sum of its proper divisors (15936502150).

21248669524 is a wasteful number, since it uses less digits than its factorization.

21248669524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5312167385 (or 5312167383 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 49.

The spelling of 21248669524 in words is "twenty-one billion, two hundred forty-eight million, six hundred sixty-nine thousand, five hundred twenty-four".