21140400111 has 16 divisors (see below), whose sum is σ = 28258237920. Its totient is φ = 14058126720.

The previous prime is 21140400101. The next prime is 21140400119. The reversal of 21140400111 is 11100404112.

It is not a de Polignac number, because 21140400111 - 2¹⁰ = 21140399087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21140400119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2194341 + ... + 2203953.

It is an arithmetic number, because the mean of its divisors is an integer number (1766139870).

Almost surely, 2^21140400111 is an apocalyptic number.

21140400111 is a deficient number, since it is larger than the sum of its proper divisors (7117837809).

21140400111 is a wasteful number, since it uses less digits than its factorization.

21140400111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11386.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21140400111 its reverse (11100404112), we get a palindrome (32240804223).

The spelling of 21140400111 in words is "twenty-one billion, one hundred forty million, four hundred thousand, one hundred eleven".