11211101101021 has 4 divisors (see below), whose sum is σ = 11211250392892. Its totient is φ = 11210951809152.

The previous prime is 11211101101007. The next prime is 11211101101027. The reversal of 11211101101021 is 12010110111211.

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 4618587828100 + 6592513272921 = 2149090^2 + 2567589^2 .

It is a cyclic number.

It is not a de Polignac number, because 11211101101021 - 2¹⁷ = 11211100969949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11211101100992 and 11211101101010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211101101027) 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, 74533236 + ... + 74683501.

It is an arithmetic number, because the mean of its divisors is an integer number (2802812598223).

Almost surely, 2^{11211101101021} is an apocalyptic number.

It is an amenable number.

11211101101021 is a deficient number, since it is larger than the sum of its proper divisors (149291871).

11211101101021 is an equidigital number, since it uses as much as digits as its factorization.

11211101101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149291870.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 11211101101021 its reverse (12010110111211), we get a palindrome (23221211212232).

The spelling of 11211101101021 in words is "eleven trillion, two hundred eleven billion, one hundred one million, one hundred one thousand, twenty-one".