21324121001 has 4 divisors (see below), whose sum is σ = 22011995904. Its totient is φ = 20636246100.

The previous prime is 21324120997. The next prime is 21324121009. The reversal of 21324121001 is 10012142312.

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 21324121001 - 2² = 21324120997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21324121009) 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, 343937405 + ... + 343937466.

It is an arithmetic number, because the mean of its divisors is an integer number (5502998976).

Almost surely, 2^21324121001 is an apocalyptic number.

It is an amenable number.

21324121001 is a deficient number, since it is larger than the sum of its proper divisors (687874903).

21324121001 is an equidigital number, since it uses as much as digits as its factorization.

21324121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687874902.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21324121001 its reverse (10012142312), we get a palindrome (31336263313).

The spelling of 21324121001 in words is "twenty-one billion, three hundred twenty-four million, one hundred twenty-one thousand, one".