1021331020011 has 4 divisors (see below), whose sum is σ = 1361774693352. Its totient is φ = 680887346672.

The previous prime is 1021331019991. The next prime is 1021331020057. The reversal of 1021331020011 is 1100201331201.

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 1021331020011 - 2⁷ = 1021331019883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1021331020091) 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, 170221836666 + ... + 170221836671.

It is an arithmetic number, because the mean of its divisors is an integer number (340443673338).

Almost surely, 2^{1021331020011} is an apocalyptic number.

1021331020011 is a deficient number, since it is larger than the sum of its proper divisors (340443673341).

1021331020011 is an equidigital number, since it uses as much as digits as its factorization.

1021331020011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340443673340.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 1021331020011 its reverse (1100201331201), we get a palindrome (2121532351212).

The spelling of 1021331020011 in words is "one trillion, twenty-one billion, three hundred thirty-one million, twenty thousand, eleven".