1111112101021 has 8 divisors (see below), whose sum is σ = 1200405213560. Its totient is φ = 1022365124352.

The previous prime is 1111112100929. The next prime is 1111112101063. The reversal of 1111112101021 is 1201012111111.

It can be written as a sum of positive squares in 4 ways, for example, as 19893692025 + 1091218408996 = 141045^2 + 1044614^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1111112101021 - 2⁷ = 1111112100893 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1111112100992 and 1111112101010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111112101621) 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, 136529736 + ... + 136537873.

It is an arithmetic number, because the mean of its divisors is an integer number (150050651695).

Almost surely, 2^{1111112101021} is an apocalyptic number.

It is an amenable number.

1111112101021 is a deficient number, since it is larger than the sum of its proper divisors (89293112539).

1111112101021 is a wasteful number, since it uses less digits than its factorization.

1111112101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273067935.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 1111112101021 its reverse (1201012111111), we get a palindrome (2312124212132).

The spelling of 1111112101021 in words is "one trillion, one hundred eleven billion, one hundred twelve million, one hundred one thousand, twenty-one".