11100212021 has 4 divisors (see below), whose sum is σ = 11119652544. Its totient is φ = 11080771500.

The previous prime is 11100212017. The next prime is 11100212041. The reversal of 11100212021 is 12021200111.

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 11100212021 - 2² = 11100212017 is a prime.

It is a super-2 number, since 2×11100212021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11100211993 and 11100212011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11100212041) 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, 9719405 + ... + 9720546.

It is an arithmetic number, because the mean of its divisors is an integer number (2779913136).

Almost surely, 2^11100212021 is an apocalyptic number.

It is an amenable number.

11100212021 is a deficient number, since it is larger than the sum of its proper divisors (19440523).

11100212021 is an equidigital number, since it uses as much as digits as its factorization.

11100212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19440522.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 11100212021 its reverse (12021200111), we get a palindrome (23121412132).

The spelling of 11100212021 in words is "eleven billion, one hundred million, two hundred twelve thousand, twenty-one".