21120232001 has 4 divisors (see below), whose sum is σ = 23040253104. Its totient is φ = 19200210900.

The previous prime is 21120231991. The next prime is 21120232009. The reversal of 21120232001 is 10023202112.

It is a happy number.

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 21120232001 - 2¹⁰ = 21120230977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21120232009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 960010535 + ... + 960010556.

It is an arithmetic number, because the mean of its divisors is an integer number (5760063276).

Almost surely, 2^21120232001 is an apocalyptic number.

It is an amenable number.

21120232001 is a deficient number, since it is larger than the sum of its proper divisors (1920021103).

21120232001 is a wasteful number, since it uses less digits than its factorization.

21120232001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1920021102.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21120232001 its reverse (10023202112), we get a palindrome (31143434113).

The spelling of 21120232001 in words is "twenty-one billion, one hundred twenty million, two hundred thirty-two thousand, one".