20211222132181 has 2 divisors, whose sum is σ = 20211222132182. Its totient is φ = 20211222132180.

The previous prime is 20211222132133. The next prime is 20211222132191. The reversal of 20211222132181 is 18123122211202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11491869481156 + 8719352651025 = 3389966^2 + 2952855^2 .

It is a cyclic number.

It is not a de Polignac number, because 20211222132181 - 2²¹ = 20211220035029 is a prime.

It is a super-2 number, since 2×20211222132181² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20211222132131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105611066090 + 10105611066091.

It is an arithmetic number, because the mean of its divisors is an integer number (10105611066091).

Almost surely, 2^{20211222132181} is an apocalyptic number.

It is an amenable number.

20211222132181 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211222132181 is an equidigital number, since it uses as much as digits as its factorization.

20211222132181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 28.

Adding to 20211222132181 its reverse (18123122211202), we get a palindrome (38334344343383).

The spelling of 20211222132181 in words is "twenty trillion, two hundred eleven billion, two hundred twenty-two million, one hundred thirty-two thousand, one hundred eighty-one".