1021312011 has 4 divisors (see below), whose sum is σ = 1361749352. Its totient is φ = 680874672.

The previous prime is 1021311983. The next prime is 1021312027. The reversal of 1021312011 is 1102131201.

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

It is not a de Polignac number, because 1021312011 - 2⁶ = 1021311947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021316011) 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, 170218666 + ... + 170218671.

It is an arithmetic number, because the mean of its divisors is an integer number (340437338).

Almost surely, 2^1021312011 is an apocalyptic number.

1021312011 is a deficient number, since it is larger than the sum of its proper divisors (340437341).

1021312011 is an equidigital number, since it uses as much as digits as its factorization.

1021312011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340437340.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 1021312011 is about 31957.9725733658. The cubic root of 1021312011 is about 1007.0541259674.

Adding to 1021312011 its reverse (1102131201), we get a palindrome (2123443212).

The spelling of 1021312011 in words is "one billion, twenty-one million, three hundred twelve thousand, eleven".