21401320111 has 16 divisors (see below), whose sum is σ = 23864924160. Its totient is φ = 19072644480.

The previous prime is 21401320079. The next prime is 21401320141. The reversal of 21401320111 is 11102310412.

It is a cyclic number.

It is not a de Polignac number, because 21401320111 - 2⁵ = 21401320079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21401320141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 666160 + ... + 697546.

It is an arithmetic number, because the mean of its divisors is an integer number (1491557760).

Almost surely, 2^21401320111 is an apocalyptic number.

21401320111 is a deficient number, since it is larger than the sum of its proper divisors (2463604049).

21401320111 is a wasteful number, since it uses less digits than its factorization.

21401320111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33534.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21401320111 its reverse (11102310412), we get a palindrome (32503630523).

The spelling of 21401320111 in words is "twenty-one billion, four hundred one million, three hundred twenty thousand, one hundred eleven".