21401044111 has 8 divisors (see below), whose sum is σ = 21450781440. Its totient is φ = 21351360408.

The previous prime is 21401044043. The next prime is 21401044139. The reversal of 21401044111 is 11144010412.

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

It is a cyclic number.

It is not a de Polignac number, because 21401044111 - 2¹⁵ = 21401011343 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 (21401044141) 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, 848890 + ... + 873736.

It is an arithmetic number, because the mean of its divisors is an integer number (2681347680).

Almost surely, 2^21401044111 is an apocalyptic number.

21401044111 is a deficient number, since it is larger than the sum of its proper divisors (49737329).

21401044111 is a wasteful number, since it uses less digits than its factorization.

21401044111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26813.

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

Adding to 21401044111 its reverse (11144010412), we get a palindrome (32545054523).

It can be divided in two parts, 214010 and 44111, that added together give a triangular number (258121 = T₇₁₈).

The spelling of 21401044111 in words is "twenty-one billion, four hundred one million, forty-four thousand, one hundred eleven".