1012112115221 has 2 divisors, whose sum is σ = 1012112115222. Its totient is φ = 1012112115220.

The previous prime is 1012112115199. The next prime is 1012112115247. The reversal of 1012112115221 is 1225112112101.

1012112115221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1011120747025 + 991368196 = 1005545^2 + 31486^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1012112115221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1012112115193 and 1012112115202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1012112115121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506056057610 + 506056057611.

It is an arithmetic number, because the mean of its divisors is an integer number (506056057611).

Almost surely, 2^{1012112115221} is an apocalyptic number.

It is an amenable number.

1012112115221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012112115221 is an equidigital number, since it uses as much as digits as its factorization.

1012112115221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80, while the sum is 20.

Adding to 1012112115221 its reverse (1225112112101), we get a palindrome (2237224227322).

The spelling of 1012112115221 in words is "one trillion, twelve billion, one hundred twelve million, one hundred fifteen thousand, two hundred twenty-one".