21201331103021 has 4 divisors (see below), whose sum is σ = 21290039601600. Its totient is φ = 21112622604444.

The previous prime is 21201331102949. The next prime is 21201331103093. The reversal of 21201331103021 is 12030113310212.

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 an interprime number because it is at equal distance from previous prime (21201331102949) and next prime (21201331103093).

It is a cyclic number.

It is not a de Polignac number, because 21201331103021 - 2¹⁰ = 21201331101997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21201331102984 and 21201331103002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201331105021) 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, 44354248931 + ... + 44354249408.

It is an arithmetic number, because the mean of its divisors is an integer number (5322509900400).

Almost surely, 2^{21201331103021} is an apocalyptic number.

It is an amenable number.

21201331103021 is a deficient number, since it is larger than the sum of its proper divisors (88708498579).

21201331103021 is an equidigital number, since it uses as much as digits as its factorization.

21201331103021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88708498578.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 21201331103021 its reverse (12030113310212), we get a palindrome (33231444413233).

The spelling of 21201331103021 in words is "twenty-one trillion, two hundred one billion, three hundred thirty-one million, one hundred three thousand, twenty-one".