1021155220011 has 8 divisors (see below), whose sum is σ = 1361613173904. Its totient is φ = 680733706400.

The previous prime is 1021155220009. The next prime is 1021155220037. The reversal of 1021155220011 is 1100225511201.

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 1021155220011 - 2¹ = 1021155220009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1021155220011.

It is not an unprimeable number, because it can be changed into a prime (1021155222011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9044616 + ... + 9156821.

It is an arithmetic number, because the mean of its divisors is an integer number (170201646738).

Almost surely, 2^{1021155220011} is an apocalyptic number.

1021155220011 is a deficient number, since it is larger than the sum of its proper divisors (340457953893).

1021155220011 is a wasteful number, since it uses less digits than its factorization.

1021155220011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18220141.

The product of its (nonzero) digits is 200, while the sum is 21.

The spelling of 1021155220011 in words is "one trillion, twenty-one billion, one hundred fifty-five million, two hundred twenty thousand, eleven".