21241012111 has 4 divisors (see below), whose sum is σ = 23172013224. Its totient is φ = 19310011000.

The previous prime is 21241012103. The next prime is 21241012127. The reversal of 21241012111 is 11121014212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21241012111 - 2³ = 21241012103 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 (21241012411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 965500540 + ... + 965500561.

It is an arithmetic number, because the mean of its divisors is an integer number (5793003306).

Almost surely, 2^21241012111 is an apocalyptic number.

21241012111 is a deficient number, since it is larger than the sum of its proper divisors (1931001113).

21241012111 is a wasteful number, since it uses less digits than its factorization.

21241012111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1931001112.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21241012111 its reverse (11121014212), we get a palindrome (32362026323).

It can be divided in two parts, 2124101 and 2111, that added together give a palindrome (2126212).

The spelling of 21241012111 in words is "twenty-one billion, two hundred forty-one million, twelve thousand, one hundred eleven".