21390519448 has 16 divisors (see below), whose sum is σ = 40413387960. Its totient is φ = 10613616000.

The previous prime is 21390519389. The next prime is 21390519457. The reversal of 21390519448 is 84491509312.

It is a junction number, because it is equal to n+sod(n) for n = 21390519398 and 21390519407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10204353 + ... + 10206448.

Almost surely, 2^21390519448 is an apocalyptic number.

It is an amenable number.

21390519448 is a deficient number, since it is larger than the sum of its proper divisors (19022868512).

21390519448 is a wasteful number, since it uses less digits than its factorization.

21390519448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20410938 (or 20410934 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 46.

The spelling of 21390519448 in words is "twenty-one billion, three hundred ninety million, five hundred nineteen thousand, four hundred forty-eight".