21033121201 has 4 divisors (see below), whose sum is σ = 22140127600. Its totient is φ = 19926114804.

The previous prime is 21033121181. The next prime is 21033121231. The reversal of 21033121201 is 10212133012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21033121201 - 2⁵ = 21033121169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21033121231) 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, 553503171 + ... + 553503208.

It is an arithmetic number, because the mean of its divisors is an integer number (5535031900).

Almost surely, 2^21033121201 is an apocalyptic number.

It is an amenable number.

21033121201 is a deficient number, since it is larger than the sum of its proper divisors (1107006399).

21033121201 is a wasteful number, since it uses less digits than its factorization.

21033121201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1107006398.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21033121201 its reverse (10212133012), we get a palindrome (31245254213).

The spelling of 21033121201 in words is "twenty-one billion, thirty-three million, one hundred twenty-one thousand, two hundred one".