1021100202121 has 4 divisors (see below), whose sum is σ = 1021104399744. Its totient is φ = 1021096004500.

The previous prime is 1021100202071. The next prime is 1021100202151. The reversal of 1021100202121 is 1212020011201.

1021100202121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1021100202121 - 2⁹ = 1021100201609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021100202151) 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, 1709905 + ... + 2228446.

It is an arithmetic number, because the mean of its divisors is an integer number (255276099936).

Almost surely, 2^{1021100202121} is an apocalyptic number.

It is an amenable number.

1021100202121 is a deficient number, since it is larger than the sum of its proper divisors (4197623).

1021100202121 is an equidigital number, since it uses as much as digits as its factorization.

1021100202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4197622.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1021100202121 its reverse (1212020011201), we get a palindrome (2233120213322).

It can be divided in two parts, 1021100 and 202121, that added together give a palindrome (1223221).

The spelling of 1021100202121 in words is "one trillion, twenty-one billion, one hundred million, two hundred two thousand, one hundred twenty-one".