1021321011 has 4 divisors (see below), whose sum is σ = 1361761352. Its totient is φ = 680880672.

The previous prime is 1021320983. The next prime is 1021321057. The reversal of 1021321011 is 1101231201.

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

It is a de Polignac number, because none of the positive numbers 2^k-1021321011 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (1021331011) 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, 170220166 + ... + 170220171.

It is an arithmetic number, because the mean of its divisors is an integer number (340440338).

Almost surely, 2^1021321011 is an apocalyptic number.

1021321011 is a deficient number, since it is larger than the sum of its proper divisors (340440341).

1021321011 is an equidigital number, since it uses as much as digits as its factorization.

1021321011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340440340.

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

The square root of 1021321011 is about 31958.1133829893. The cubic root of 1021321011 is about 1007.0570840777.

Adding to 1021321011 its reverse (1101231201), we get a palindrome (2122552212).

The spelling of 1021321011 in words is "one billion, twenty-one million, three hundred twenty-one thousand, eleven".