21982212871 has 12 divisors (see below), whose sum is σ = 22741402944. Its totient is φ = 21248344260.

The previous prime is 21982212869. The next prime is 21982212877. The reversal of 21982212871 is 17821228912.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is not a de Polignac number, because 21982212871 - 2¹ = 21982212869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21982212877) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25590040 + ... + 25590898.

It is an arithmetic number, because the mean of its divisors is an integer number (1895116912).

Almost surely, 2^21982212871 is an apocalyptic number.

21982212871 is a deficient number, since it is larger than the sum of its proper divisors (759190073).

21982212871 is an frugal number, since it uses more digits than its factorization.

21982212871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1811 (or 890 counting only the distinct ones).

The product of its digits is 64512, while the sum is 43.

The spelling of 21982212871 in words is "twenty-one billion, nine hundred eighty-two million, two hundred twelve thousand, eight hundred seventy-one".