21101243001 has 16 divisors (see below), whose sum is σ = 29243127360. Its totient is φ = 13518025920.

The previous prime is 21101242991. The next prime is 21101243039. The reversal of 21101243001 is 10034210112.

It is not a de Polignac number, because 21101243001 - 2¹⁹ = 21100718713 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21101243101) 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, 556390 + ... + 593103.

It is an arithmetic number, because the mean of its divisors is an integer number (1827695460).

Almost surely, 2^21101243001 is an apocalyptic number.

It is an amenable number.

21101243001 is a deficient number, since it is larger than the sum of its proper divisors (8141884359).

21101243001 is a wasteful number, since it uses less digits than its factorization.

21101243001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1149736.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21101243001 its reverse (10034210112), we get a palindrome (31135453113).

The spelling of 21101243001 in words is "twenty-one billion, one hundred one million, two hundred forty-three thousand, one".