21121330201 has 4 divisors (see below), whose sum is σ = 21221431504. Its totient is φ = 21021228900.

The previous prime is 21121330193. The next prime is 21121330211. The reversal of 21121330201 is 10203312112.

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 21121330201 - 2³ = 21121330193 is a prime.

It is a super-2 number, since 2×21121330201² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121330211) 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, 50050335 + ... + 50050756.

It is an arithmetic number, because the mean of its divisors is an integer number (5305357876).

Almost surely, 2^21121330201 is an apocalyptic number.

It is an amenable number.

21121330201 is a deficient number, since it is larger than the sum of its proper divisors (100101303).

21121330201 is a wasteful number, since it uses less digits than its factorization.

21121330201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100101302.

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

Adding to 21121330201 its reverse (10203312112), we get a palindrome (31324642313).

The spelling of 21121330201 in words is "twenty-one billion, one hundred twenty-one million, three hundred thirty thousand, two hundred one".