21033243101 has 4 divisors (see below), whose sum is σ = 22651184892. Its totient is φ = 19415301312.

The previous prime is 21033243037. The next prime is 21033243107. The reversal of 21033243101 is 10134233012.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13529179225 + 7504063876 = 116315^2 + 86626^2 .

It is a cyclic number.

It is not a de Polignac number, because 21033243101 - 2⁶ = 21033243037 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 (21033243107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 808970876 + ... + 808970901.

It is an arithmetic number, because the mean of its divisors is an integer number (5662796223).

Almost surely, 2^21033243101 is an apocalyptic number.

It is an amenable number.

21033243101 is a deficient number, since it is larger than the sum of its proper divisors (1617941791).

21033243101 is a wasteful number, since it uses less digits than its factorization.

21033243101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1617941790.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21033243101 its reverse (10134233012), we get a palindrome (31167476113).

The spelling of 21033243101 in words is "twenty-one billion, thirty-three million, two hundred forty-three thousand, one hundred one".