21321223102001 has 24 divisors (see below), whose sum is σ = 22451702760480. Its totient is φ = 20244952728000.

The previous prime is 21321223101991. The next prime is 21321223102007. The reversal of 21321223102001 is 10020132212312.

It is a de Polignac number, because none of the positive numbers 2^k-21321223102001 is a prime.

It is a super-2 number, since 2×21321223102001² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21321223102007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 867727046 + ... + 867751616.

It is an arithmetic number, because the mean of its divisors is an integer number (935487615020).

Almost surely, 2^{21321223102001} is an apocalyptic number.

It is an amenable number.

21321223102001 is a deficient number, since it is larger than the sum of its proper divisors (1130479658479).

21321223102001 is a wasteful number, since it uses less digits than its factorization.

21321223102001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36557 (or 36534 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21321223102001 its reverse (10020132212312), we get a palindrome (31341355314313).

The spelling of 21321223102001 in words is "twenty-one trillion, three hundred twenty-one billion, two hundred twenty-three million, one hundred two thousand, one".