21220311342231 has 12 divisors (see below), whose sum is σ = 30651600929352. Its totient is φ = 14146855719696.

The previous prime is 21220311342229. The next prime is 21220311342257. The reversal of 21220311342231 is 13224311302212.

21220311342231 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 0 + 311 + 342 + 2 + 3 + 1 = 666.

It is not a de Polignac number, because 21220311342231 - 2¹ = 21220311342229 is a prime.

It is a super-2 number, since 2×21220311342231² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21220311342195 and 21220311342204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220311342221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11730240 + ... + 13417866.

It is an arithmetic number, because the mean of its divisors is an integer number (2554300077446).

Almost surely, 2^{21220311342231} is an apocalyptic number.

21220311342231 is a deficient number, since it is larger than the sum of its proper divisors (9431289587121).

21220311342231 is a wasteful number, since it uses less digits than its factorization.

21220311342231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3084750 (or 3084747 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

Adding to 21220311342231 its reverse (13224311302212), we get a palindrome (34444622644443).

The spelling of 21220311342231 in words is "twenty-one trillion, two hundred twenty billion, three hundred eleven million, three hundred forty-two thousand, two hundred thirty-one".