21121323001 has 8 divisors (see below), whose sum is σ = 22514403200. Its totient is φ = 19756386000.

The previous prime is 21121322983. The next prime is 21121323023. The reversal of 21121323001 is 10032312112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21121323001 - 2¹¹ = 21121320953 is a prime.

It is a super-2 number, since 2×21121323001² (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 (21121323401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7034250 + ... + 7037251.

It is an arithmetic number, because the mean of its divisors is an integer number (2814300400).

Almost surely, 2^21121323001 is an apocalyptic number.

It is an amenable number.

21121323001 is a deficient number, since it is larger than the sum of its proper divisors (1393080199).

21121323001 is a wasteful number, since it uses less digits than its factorization.

21121323001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14071599.

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

Adding to 21121323001 its reverse (10032312112), we get a palindrome (31153635113).

The spelling of 21121323001 in words is "twenty-one billion, one hundred twenty-one million, three hundred twenty-three thousand, one".