981021220111 has 16 divisors (see below), whose sum is σ = 989116380000. Its totient is φ = 972966711168.

The previous prime is 981021220051. The next prime is 981021220237. The reversal of 981021220111 is 111022120189.

It is a cyclic number.

It is not a de Polignac number, because 981021220111 - 2¹¹ = 981021218063 is a prime.

It is a super-2 number, since 2×981021220111² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 981021220111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981021221111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63641241 + ... + 63656653.

It is an arithmetic number, because the mean of its divisors is an integer number (61819773750).

Almost surely, 2^981021220111 is an apocalyptic number.

981021220111 is a deficient number, since it is larger than the sum of its proper divisors (8095159889).

981021220111 is a wasteful number, since it uses less digits than its factorization.

981021220111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16698.

The product of its (nonzero) digits is 576, while the sum is 28.

The spelling of 981021220111 in words is "nine hundred eighty-one billion, twenty-one million, two hundred twenty thousand, one hundred eleven".