1012000121221 has 2 divisors, whose sum is σ = 1012000121222. Its totient is φ = 1012000121220.

The previous prime is 1012000121213. The next prime is 1012000121257. The reversal of 1012000121221 is 1221210002101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 753823332900 + 258176788321 = 868230^2 + 508111^2 .

It is a cyclic number.

It is not a de Polignac number, because 1012000121221 - 2³ = 1012000121213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1012000121291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506000060610 + 506000060611.

It is an arithmetic number, because the mean of its divisors is an integer number (506000060611).

Almost surely, 2^{1012000121221} is an apocalyptic number.

It is an amenable number.

1012000121221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012000121221 is an equidigital number, since it uses as much as digits as its factorization.

1012000121221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1012000121221 its reverse (1221210002101), we get a palindrome (2233210123322).

The spelling of 1012000121221 in words is "one trillion, twelve billion, one hundred twenty-one thousand, two hundred twenty-one".