1012311231221 has 8 divisors (see below), whose sum is σ = 1013286427800. Its totient is φ = 1011336353280.

The previous prime is 1012311231187. The next prime is 1012311231227. The reversal of 1012311231221 is 1221321132101.

It can be written as a sum of positive squares in 4 ways, for example, as 69006036100 + 943305195121 = 262690^2 + 971239^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1012311231221 - 2¹⁰ = 1012311230197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1012311231193 and 1012311231202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012311231227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6540395 + ... + 6693383.

It is an arithmetic number, because the mean of its divisors is an integer number (126660803475).

Almost surely, 2^{1012311231221} is an apocalyptic number.

It is an amenable number.

1012311231221 is a deficient number, since it is larger than the sum of its proper divisors (975196579).

1012311231221 is a wasteful number, since it uses less digits than its factorization.

1012311231221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159319.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 1012311231221 its reverse (1221321132101), we get a palindrome (2233632363322).

The spelling of 1012311231221 in words is "one trillion, twelve billion, three hundred eleven million, two hundred thirty-one thousand, two hundred twenty-one".