1020012111121 has 4 divisors (see below), whose sum is σ = 1041714496512. Its totient is φ = 998309725732.

The previous prime is 1020012111101. The next prime is 1020012111197. The reversal of 1020012111121 is 1211112100201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1020012111121 - 2¹⁵ = 1020012078353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020012111101) 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 3 ways as a sum of consecutive naturals, for example, 10851192625 + ... + 10851192718.

It is an arithmetic number, because the mean of its divisors is an integer number (260428624128).

Almost surely, 2^{1020012111121} is an apocalyptic number.

It is an amenable number.

1020012111121 is a deficient number, since it is larger than the sum of its proper divisors (21702385391).

1020012111121 is an equidigital number, since it uses as much as digits as its factorization.

1020012111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21702385390.

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

Adding to 1020012111121 its reverse (1211112100201), we get a palindrome (2231124211322).

It can be divided in two parts, 102001 and 2111121, that added together give a palindrome (2213122).

The spelling of 1020012111121 in words is "one trillion, twenty billion, twelve million, one hundred eleven thousand, one hundred twenty-one".