20101001212321 has 4 divisors (see below), whose sum is σ = 20125248500500. Its totient is φ = 20076753924144.

The previous prime is 20101001212297. The next prime is 20101001212349. The reversal of 20101001212321 is 12321210010102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9268608824721 + 10832392387600 = 3044439^2 + 3291260^2 .

It is a cyclic number.

It is not a de Polignac number, because 20101001212321 - 2¹¹ = 20101001210273 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20101001212295 and 20101001212304.

It is not an unprimeable number, because it can be changed into a prime (20101001212421) 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, 12123642846 + ... + 12123644503.

It is an arithmetic number, because the mean of its divisors is an integer number (5031312125125).

Almost surely, 2^{20101001212321} is an apocalyptic number.

It is an amenable number.

20101001212321 is a deficient number, since it is larger than the sum of its proper divisors (24247288179).

20101001212321 is an equidigital number, since it uses as much as digits as its factorization.

20101001212321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24247288178.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 20101001212321 its reverse (12321210010102), we get a palindrome (32422211222423).

The spelling of 20101001212321 in words is "twenty trillion, one hundred one billion, one million, two hundred twelve thousand, three hundred twenty-one".