1021100211121 has 4 divisors (see below), whose sum is σ = 1021117828132. Its totient is φ = 1021082594112.

The previous prime is 1021100211113. The next prime is 1021100211137. The reversal of 1021100211121 is 1211120011201.

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 411624896400 + 609475314721 = 641580^2 + 780689^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021100211121 - 2³ = 1021100211113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021100217121) 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, 8721276 + ... + 8837581.

It is an arithmetic number, because the mean of its divisors is an integer number (255279457033).

Almost surely, 2^{1021100211121} is an apocalyptic number.

It is an amenable number.

1021100211121 is a deficient number, since it is larger than the sum of its proper divisors (17617011).

1021100211121 is an equidigital number, since it uses as much as digits as its factorization.

1021100211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17617010.

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

Adding to 1021100211121 its reverse (1211120011201), we get a palindrome (2232220222322).

The spelling of 1021100211121 in words is "one trillion, twenty-one billion, one hundred million, two hundred eleven thousand, one hundred twenty-one".