20120021112181 has 2 divisors, whose sum is σ = 20120021112182. Its totient is φ = 20120021112180.

The previous prime is 20120021112167. The next prime is 20120021112187. The reversal of 20120021112181 is 18121112002102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12465065748100 + 7654955364081 = 3530590^2 + 2766759^2 .

It is a cyclic number.

It is not a de Polignac number, because 20120021112181 - 2³⁹ = 19570265298293 is a prime.

It is a super-2 number, since 2×20120021112181² (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 (20120021112187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060010556090 + 10060010556091.

It is an arithmetic number, because the mean of its divisors is an integer number (10060010556091).

Almost surely, 2^{20120021112181} is an apocalyptic number.

It is an amenable number.

20120021112181 is a deficient number, since it is larger than the sum of its proper divisors (1).

20120021112181 is an equidigital number, since it uses as much as digits as its factorization.

20120021112181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 22.

Adding to 20120021112181 its reverse (18121112002102), we get a palindrome (38241133114283).

The spelling of 20120021112181 in words is "twenty trillion, one hundred twenty billion, twenty-one million, one hundred twelve thousand, one hundred eighty-one".