1012211551061 has 2 divisors, whose sum is σ = 1012211551062. Its totient is φ = 1012211551060.

The previous prime is 1012211551019. The next prime is 1012211551063. The reversal of 1012211551061 is 1601551122101.

It is a happy number.

1012211551061 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 801080490961 + 211131060100 = 895031^2 + 459490^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1012211551061 is a prime.

Together with 1012211551063, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1012211551061.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1012211551063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506105775530 + 506105775531.

It is an arithmetic number, because the mean of its divisors is an integer number (506105775531).

Almost surely, 2^{1012211551061} is an apocalyptic number.

It is an amenable number.

1012211551061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012211551061 is an equidigital number, since it uses as much as digits as its factorization.

1012211551061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 600, while the sum is 26.

Adding to 1012211551061 its reverse (1601551122101), we get a palindrome (2613762673162).

The spelling of 1012211551061 in words is "one trillion, twelve billion, two hundred eleven million, five hundred fifty-one thousand, sixty-one".