111221000221021 has 4 divisors (see below), whose sum is σ = 111957563136544. Its totient is φ = 110484437305500.

The previous prime is 111221000220977. The next prime is 111221000221027. The reversal of 111221000221021 is 120122000122111.

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 111221000221021 - 2¹⁹ = 111220999696733 is a prime.

It is a super-2 number, since 2×111221000221021² (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 = 111221000220986 and 111221000221004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111221000221027) 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, 368281457535 + ... + 368281457836.

It is an arithmetic number, because the mean of its divisors is an integer number (27989390784136).

Almost surely, 2^{111221000221021} is an apocalyptic number.

It is an amenable number.

111221000221021 is a deficient number, since it is larger than the sum of its proper divisors (736562915523).

111221000221021 is an equidigital number, since it uses as much as digits as its factorization.

111221000221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736562915522.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 111221000221021 its reverse (120122000122111), we get a palindrome (231343000343132).

The spelling of 111221000221021 in words is "one hundred eleven trillion, two hundred twenty-one billion, two hundred twenty-one thousand, twenty-one".