21103201311331 has 4 divisors (see below), whose sum is σ = 22020731803152. Its totient is φ = 20185670819512.

The previous prime is 21103201311301. The next prime is 21103201311349. The reversal of 21103201311331 is 13311310230112.

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

It is a cyclic number.

It is not a de Polignac number, because 21103201311331 - 2¹⁵ = 21103201278563 is a prime.

It is a super-2 number, since 2×21103201311331² (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 (21103201311301) 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, 458765245876 + ... + 458765245921.

It is an arithmetic number, because the mean of its divisors is an integer number (5505182950788).

Almost surely, 2^{21103201311331} is an apocalyptic number.

21103201311331 is a deficient number, since it is larger than the sum of its proper divisors (917530491821).

21103201311331 is an equidigital number, since it uses as much as digits as its factorization.

21103201311331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917530491820.

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 21103201311331 its reverse (13311310230112), we get a palindrome (34414511541443).

The spelling of 21103201311331 in words is "twenty-one trillion, one hundred three billion, two hundred one million, three hundred eleven thousand, three hundred thirty-one".