21374220211 has 4 divisors (see below), whose sum is σ = 21374815624. Its totient is φ = 21373624800.

The previous prime is 21374220209. The next prime is 21374220223. The reversal of 21374220211 is 11202247312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21374220211 - 2¹ = 21374220209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21374220251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 240150 + ... + 316891.

It is an arithmetic number, because the mean of its divisors is an integer number (5343703906).

Almost surely, 2^21374220211 is an apocalyptic number.

21374220211 is a deficient number, since it is larger than the sum of its proper divisors (595413).

21374220211 is an equidigital number, since it uses as much as digits as its factorization.

21374220211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595412.

The product of its (nonzero) digits is 1344, while the sum is 25.

Adding to 21374220211 its reverse (11202247312), we get a palindrome (32576467523).

The spelling of 21374220211 in words is "twenty-one billion, three hundred seventy-four million, two hundred twenty thousand, two hundred eleven".