21204140200111 has 8 divisors (see below), whose sum is σ = 23179287855744. Its totient is φ = 19236908968920.

The previous prime is 21204140200063. The next prime is 21204140200127. The reversal of 21204140200111 is 11100204140212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21204140200111 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 (21204140209111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1979100505 + ... + 1979111218.

It is an arithmetic number, because the mean of its divisors is an integer number (2897410981968).

Almost surely, 2^{21204140200111} is an apocalyptic number.

21204140200111 is a deficient number, since it is larger than the sum of its proper divisors (1975147655633).

21204140200111 is a wasteful number, since it uses less digits than its factorization.

21204140200111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3958212221.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21204140200111 its reverse (11100204140212), we get a palindrome (32304344340323).

The spelling of 21204140200111 in words is "twenty-one trillion, two hundred four billion, one hundred forty million, two hundred thousand, one hundred eleven".