21440122011 has 64 divisors (see below), whose sum is σ = 39928550400. Its totient is φ = 11137595040.

The previous prime is 21440122001. The next prime is 21440122019. The reversal of 21440122011 is 11022104412.

21440122011 is a `hidden beast` number, since 2 + 1 + 440 + 1 + 220 + 1 + 1 = 666.

It is not a de Polignac number, because 21440122011 - 2⁷ = 21440121883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21440122019) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 208945 + ... + 294173.

It is an arithmetic number, because the mean of its divisors is an integer number (623883600).

Almost surely, 2^21440122011 is an apocalyptic number.

21440122011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21440122011 is a deficient number, since it is larger than the sum of its proper divisors (18488428389).

21440122011 is an equidigital number, since it uses as much as digits as its factorization.

21440122011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85278 (or 85250 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21440122011 its reverse (11022104412), we get a palindrome (32462226423).

The spelling of 21440122011 in words is "twenty-one billion, four hundred forty million, one hundred twenty-two thousand, eleven".