21203333101 has 4 divisors (see below), whose sum is σ = 21345637500. Its totient is φ = 21061028704.

The previous prime is 21203333083. The next prime is 21203333131. The reversal of 21203333101 is 10133330212.

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 1293840900 + 19909492201 = 35970^2 + 141101^2 .

It is a cyclic number.

It is not a de Polignac number, because 21203333101 - 2⁹ = 21203332589 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 (21203333131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71151976 + ... + 71152273.

It is an arithmetic number, because the mean of its divisors is an integer number (5336409375).

Almost surely, 2^21203333101 is an apocalyptic number.

It is an amenable number.

21203333101 is a deficient number, since it is larger than the sum of its proper divisors (142304399).

21203333101 is a wasteful number, since it uses less digits than its factorization.

21203333101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142304398.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21203333101 its reverse (10133330212), we get a palindrome (31336663313).

The spelling of 21203333101 in words is "twenty-one billion, two hundred three million, three hundred thirty-three thousand, one hundred one".