21980381395 has 32 divisors (see below), whose sum is σ = 30672017280. Its totient is φ = 14810065920.

The previous prime is 21980381393. The next prime is 21980381413. The reversal of 21980381395 is 59318308912.

It is not a de Polignac number, because 21980381395 - 2¹ = 21980381393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21980381393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 671305 + ... + 703285.

It is an arithmetic number, because the mean of its divisors is an integer number (958500540).

Almost surely, 2^21980381395 is an apocalyptic number.

21980381395 is a deficient number, since it is larger than the sum of its proper divisors (8691635885).

21980381395 is a wasteful number, since it uses less digits than its factorization.

21980381395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32335.

The product of its (nonzero) digits is 466560, while the sum is 49.

The spelling of 21980381395 in words is "twenty-one billion, nine hundred eighty million, three hundred eighty-one thousand, three hundred ninety-five".