21222021442131 has 8 divisors (see below), whose sum is σ = 31440031766160. Its totient is φ = 14148014294736.

The previous prime is 21222021442129. The next prime is 21222021442159. The reversal of 21222021442131 is 13124412022212.

21222021442131 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 20 + 214 + 421 + 3 + 1 = 666.

It is not a de Polignac number, because 21222021442131 - 2¹ = 21222021442129 is a prime.

It is a super-2 number, since 2×21222021442131² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 786000794153 = 21222021442131 / (2 + 1 + 2 + 2 + 2 + 0 + 2 + 1 + 4 + 4 + 2 + 1 + 3 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 21222021442095 and 21222021442104.

It is not an unprimeable number, because it can be changed into a prime (21222021444131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 393000397050 + ... + 393000397103.

It is an arithmetic number, because the mean of its divisors is an integer number (3930003970770).

Almost surely, 2^{21222021442131} is an apocalyptic number.

21222021442131 is a deficient number, since it is larger than the sum of its proper divisors (10218010324029).

21222021442131 is an equidigital number, since it uses as much as digits as its factorization.

21222021442131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786000794162 (or 786000794156 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

Adding to 21222021442131 its reverse (13124412022212), we get a palindrome (34346433464343).

The spelling of 21222021442131 in words is "twenty-one trillion, two hundred twenty-two billion, twenty-one million, four hundred forty-two thousand, one hundred thirty-one".