1012010111221 has 2 divisors, whose sum is σ = 1012010111222. Its totient is φ = 1012010111220.

The previous prime is 1012010111219. The next prime is 1012010111251. The reversal of 1012010111221 is 1221110102101.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1010505447121 + 1504664100 = 1005239^2 + 38790^2 .

It is an emirp because it is prime and its reverse (1221110102101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1012010111221 - 2¹ = 1012010111219 is a prime.

It is a super-2 number, since 2×1012010111221² (a number of 25 digits) contains 22 as substring.

Together with 1012010111219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1012010111251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506005055610 + 506005055611.

It is an arithmetic number, because the mean of its divisors is an integer number (506005055611).

Almost surely, 2^{1012010111221} is an apocalyptic number.

It is an amenable number.

1012010111221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012010111221 is an equidigital number, since it uses as much as digits as its factorization.

1012010111221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1012010111221 its reverse (1221110102101), we get a palindrome (2233120213322).

The spelling of 1012010111221 in words is "one trillion, twelve billion, ten million, one hundred eleven thousand, two hundred twenty-one".