21241101243 has 64 divisors (see below), whose sum is σ = 32267289600. Its totient is φ = 12356467200.

The previous prime is 21241101223. The next prime is 21241101269. The reversal of 21241101243 is 34210114212.

It is not a de Polignac number, because 21241101243 - 2⁶ = 21241101179 is a prime.

It is a super-2 number, since 2×21241101243² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21241101223) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 26650921 + ... + 26651717.

It is an arithmetic number, because the mean of its divisors is an integer number (504176400).

Almost surely, 2^21241101243 is an apocalyptic number.

21241101243 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21241101243 is a deficient number, since it is larger than the sum of its proper divisors (11026188357).

21241101243 is a wasteful number, since it uses less digits than its factorization.

21241101243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1572.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21241101243 its reverse (34210114212), we get a palindrome (55451215455).

The spelling of 21241101243 in words is "twenty-one billion, two hundred forty-one million, one hundred one thousand, two hundred forty-three".