21097377389 has 8 divisors (see below), whose sum is σ = 23226471840. Its totient is φ = 19003474800.

The previous prime is 21097377373. The next prime is 21097377401. The reversal of 21097377389 is 98377379012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21097377389 - 2⁴ = 21097377373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21097377089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8796707 + ... + 8799104.

It is an arithmetic number, because the mean of its divisors is an integer number (2903308980).

Almost surely, 2^21097377389 is an apocalyptic number.

It is an amenable number.

21097377389 is a deficient number, since it is larger than the sum of its proper divisors (2129094451).

21097377389 is a wasteful number, since it uses less digits than its factorization.

21097377389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17595931.

The product of its (nonzero) digits is 4000752, while the sum is 56.

The spelling of 21097377389 in words is "twenty-one billion, ninety-seven million, three hundred seventy-seven thousand, three hundred eighty-nine".