1020210111121 has 4 divisors (see below), whose sum is σ = 1022989975552. Its totient is φ = 1017430246692.

The previous prime is 1020210111103. The next prime is 1020210111149. The reversal of 1020210111121 is 1211110120201.

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 1020210111121 - 2⁷ = 1020210110993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020210111101) 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, 1389931665 + ... + 1389932398.

It is an arithmetic number, because the mean of its divisors is an integer number (255747493888).

Almost surely, 2^{1020210111121} is an apocalyptic number.

It is an amenable number.

1020210111121 is a deficient number, since it is larger than the sum of its proper divisors (2779864431).

1020210111121 is an equidigital number, since it uses as much as digits as its factorization.

1020210111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2779864430.

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

Adding to 1020210111121 its reverse (1211110120201), we get a palindrome (2231320231322).

The spelling of 1020210111121 in words is "one trillion, twenty billion, two hundred ten million, one hundred eleven thousand, one hundred twenty-one".