1021312221011 has 4 divisors (see below), whose sum is σ = 1046222275224. Its totient is φ = 996402166800.

The previous prime is 1021312221001. The next prime is 1021312221019. The reversal of 1021312221011 is 1101222131201.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1021312221011 - 2⁶ = 1021312220947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021312221019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12455027045 + ... + 12455027126.

It is an arithmetic number, because the mean of its divisors is an integer number (261555568806).

Almost surely, 2^{1021312221011} is an apocalyptic number.

1021312221011 is a deficient number, since it is larger than the sum of its proper divisors (24910054213).

1021312221011 is an equidigital number, since it uses as much as digits as its factorization.

1021312221011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24910054212.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 1021312221011 its reverse (1101222131201), we get a palindrome (2122534352212).

The spelling of 1021312221011 in words is "one trillion, twenty-one billion, three hundred twelve million, two hundred twenty-one thousand, eleven".