21980853 has 24 divisors (see below), whose sum is σ = 33646080. Its totient is φ = 13789440.

The previous prime is 21980851. The next prime is 21980857. The reversal of 21980853 is 35808912.

It is not a de Polignac number, because 21980853 - 2¹ = 21980851 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21980851) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32325 + ... + 32997.

It is an arithmetic number, because the mean of its divisors is an integer number (1401920).

Almost surely, 2^21980853 is an apocalyptic number.

It is an amenable number.

21980853 is a deficient number, since it is larger than the sum of its proper divisors (11665227).

21980853 is a wasteful number, since it uses less digits than its factorization.

21980853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889 (or 886 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 21980853 is about 4688.3742384754. The cubic root of 21980853 is about 280.1226206126.

The spelling of 21980853 in words is "twenty-one million, nine hundred eighty thousand, eight hundred fifty-three".