11211112220021 has 64 divisors (see below), whose sum is σ = 14035785007104. Its totient is φ = 8732678169600.

The previous prime is 11211112219961. The next prime is 11211112220039. The reversal of 11211112220021 is 12002221111211.

It is a de Polignac number, because none of the positive numbers 2^k-11211112220021 is a prime.

It is a super-2 number, since 2×11211112220021² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211112220041) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4945350530 + ... + 4945352796.

It is an arithmetic number, because the mean of its divisors is an integer number (219309140736).

Almost surely, 2^{11211112220021} is an apocalyptic number.

It is an amenable number.

11211112220021 is a deficient number, since it is larger than the sum of its proper divisors (2824672787083).

11211112220021 is a wasteful number, since it uses less digits than its factorization.

11211112220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4770.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 11211112220021 its reverse (12002221111211), we get a palindrome (23213333331232).

The spelling of 11211112220021 in words is "eleven trillion, two hundred eleven billion, one hundred twelve million, two hundred twenty thousand, twenty-one".