11121210211021 has 4 divisors (see below), whose sum is σ = 11122958560444. Its totient is φ = 11119461861600.

The previous prime is 11121210210967. The next prime is 11121210211063. The reversal of 11121210211021 is 12011201212111.

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 7603282334025 + 3517927876996 = 2757405^2 + 1875614^2 .

It is a cyclic number.

It is not a de Polignac number, because 11121210211021 - 2²⁵ = 11121176656589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11121210210986 and 11121210211004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11121210211621) 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, 874165170 + ... + 874177891.

It is an arithmetic number, because the mean of its divisors is an integer number (2780739640111).

Almost surely, 2^{11121210211021} is an apocalyptic number.

It is an amenable number.

11121210211021 is a deficient number, since it is larger than the sum of its proper divisors (1748349423).

11121210211021 is an equidigital number, since it uses as much as digits as its factorization.

11121210211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1748349422.

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

Adding to 11121210211021 its reverse (12011201212111), we get a palindrome (23132411423132).

The spelling of 11121210211021 in words is "eleven trillion, one hundred twenty-one billion, two hundred ten million, two hundred eleven thousand, twenty-one".