21390519398 has 16 divisors (see below), whose sum is σ = 32857795584. Its totient is φ = 10439161800.

The previous prime is 21390519389. The next prime is 21390519457. The reversal of 21390519398 is 89391509312.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 275528 + ... + 344523.

It is an arithmetic number, because the mean of its divisors is an integer number (2053612224).

Almost surely, 2^21390519398 is an apocalyptic number.

21390519398 is a deficient number, since it is larger than the sum of its proper divisors (11467276186).

21390519398 is a wasteful number, since it uses less digits than its factorization.

21390519398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620467.

The product of its (nonzero) digits is 524880, while the sum is 50.

The spelling of 21390519398 in words is "twenty-one billion, three hundred ninety million, five hundred nineteen thousand, three hundred ninety-eight".