1021002112111 has 4 divisors (see below), whose sum is σ = 1074739065400. Its totient is φ = 967265158824.

The previous prime is 1021002112087. The next prime is 1021002112139. The reversal of 1021002112111 is 1112112001201.

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 1021002112111 - 2⁵ = 1021002112079 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021002112091 and 1021002112100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021002112511) 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, 26868476616 + ... + 26868476653.

It is an arithmetic number, because the mean of its divisors is an integer number (268684766350).

Almost surely, 2^{1021002112111} is an apocalyptic number.

1021002112111 is a deficient number, since it is larger than the sum of its proper divisors (53736953289).

1021002112111 is an equidigital number, since it uses as much as digits as its factorization.

1021002112111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53736953288.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1021002112111 its reverse (1112112001201), we get a palindrome (2133114113312).

The spelling of 1021002112111 in words is "one trillion, twenty-one billion, two million, one hundred twelve thousand, one hundred eleven".