21387703798 has 16 divisors (see below), whose sum is σ = 32200171344. Its totient is φ = 10654364160.

The previous prime is 21387703787. The next prime is 21387703801. The reversal of 21387703798 is 89730778312.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 888238 + ... + 911998.

It is an arithmetic number, because the mean of its divisors is an integer number (2012510709).

Almost surely, 2^21387703798 is an apocalyptic number.

21387703798 is a deficient number, since it is larger than the sum of its proper divisors (10812467546).

21387703798 is a wasteful number, since it uses less digits than its factorization.

21387703798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25407.

The product of its (nonzero) digits is 3556224, while the sum is 55.

The spelling of 21387703798 in words is "twenty-one billion, three hundred eighty-seven million, seven hundred three thousand, seven hundred ninety-eight".