22021012002181 has 2 divisors, whose sum is σ = 22021012002182. Its totient is φ = 22021012002180.

The previous prime is 22021012002169. The next prime is 22021012002203. The reversal of 22021012002181 is 18120021012022.

It is an a-pointer prime, because the next prime (22021012002203) can be obtained adding 22021012002181 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20028936636900 + 1992075365281 = 4475370^2 + 1411409^2 .

It is a cyclic number.

It is not a de Polignac number, because 22021012002181 - 2³¹ = 22018864518533 is a prime.

It is a super-2 number, since 2×22021012002181² (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 (22021012072181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11010506001090 + 11010506001091.

It is an arithmetic number, because the mean of its divisors is an integer number (11010506001091).

Almost surely, 2^{22021012002181} is an apocalyptic number.

It is an amenable number.

22021012002181 is a deficient number, since it is larger than the sum of its proper divisors (1).

22021012002181 is an equidigital number, since it uses as much as digits as its factorization.

22021012002181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 22.

The spelling of 22021012002181 in words is "twenty-two trillion, twenty-one billion, twelve million, two thousand, one hundred eighty-one".