221011120111021 has 4 divisors (see below), whose sum is σ = 221012019722844. Its totient is φ = 221010220499200.

The previous prime is 221011120110961. The next prime is 221011120111069. The reversal of 221011120111021 is 120111021110122.

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 1372377105225 + 219638743005796 = 1171485^2 + 14820214^2 .

It is a cyclic number.

It is not a de Polignac number, because 221011120111021 - 2¹¹ = 221011120108973 is a prime.

It is a super-2 number, since 2×221011120111021² (a number of 29 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 = 221011120110986 and 221011120111004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221011120111081) 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, 449437300 + ... + 449928781.

It is an arithmetic number, because the mean of its divisors is an integer number (55253004930711).

Almost surely, 2^{221011120111021} is an apocalyptic number.

It is an amenable number.

221011120111021 is a deficient number, since it is larger than the sum of its proper divisors (899611823).

221011120111021 is an equidigital number, since it uses as much as digits as its factorization.

221011120111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899611822.

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

Adding to 221011120111021 its reverse (120111021110122), we get a palindrome (341122141221143).

The spelling of 221011120111021 in words is "two hundred twenty-one trillion, eleven billion, one hundred twenty million, one hundred eleven thousand, twenty-one".