1021021121101 has 4 divisors (see below), whose sum is σ = 1021509883900. Its totient is φ = 1020532358304.

The previous prime is 1021021121039. The next prime is 1021021121119. The reversal of 1021021121101 is 1011211201201.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 713771522500 + 307249598601 = 844850^2 + 554301^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021021121101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021021121501) 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, 244378266 + ... + 244382443.

It is an arithmetic number, because the mean of its divisors is an integer number (255377470975).

Almost surely, 2^{1021021121101} is an apocalyptic number.

It is an amenable number.

1021021121101 is a deficient number, since it is larger than the sum of its proper divisors (488762799).

1021021121101 is an equidigital number, since it uses as much as digits as its factorization.

1021021121101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488762798.

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

Adding to 1021021121101 its reverse (1011211201201), we get a palindrome (2032232322302).

The spelling of 1021021121101 in words is "one trillion, twenty-one billion, twenty-one million, one hundred twenty-one thousand, one hundred one".