21211322021231 has 16 divisors (see below), whose sum is σ = 21765554556480. Its totient is φ = 20658867482880.

The previous prime is 21211322021167. The next prime is 21211322021237. The reversal of 21211322021231 is 13212022311212.

It is a cyclic number.

It is not a de Polignac number, because 21211322021231 - 2⁶ = 21211322021167 is a prime.

It is a super-2 number, since 2×21211322021231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21211322021197 and 21211322021206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211322021237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79193885 + ... + 79461273.

It is an arithmetic number, because the mean of its divisors is an integer number (1360347159780).

Almost surely, 2^{21211322021231} is an apocalyptic number.

21211322021231 is a deficient number, since it is larger than the sum of its proper divisors (554232535249).

21211322021231 is a wasteful number, since it uses less digits than its factorization.

21211322021231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270706.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 21211322021231 its reverse (13212022311212), we get a palindrome (34423344332443).

The spelling of 21211322021231 in words is "twenty-one trillion, two hundred eleven billion, three hundred twenty-two million, twenty-one thousand, two hundred thirty-one".