111021020001221 has 4 divisors (see below), whose sum is σ = 121113840001344. Its totient is φ = 100928200001100.

The previous prime is 111021020001197. The next prime is 111021020001277. The reversal of 111021020001221 is 122100020120111.

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 111021020001221 - 2¹⁰ = 111021020000197 is a prime.

It is a super-2 number, since 2×111021020001221² (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 = 111021020001196 and 111021020001205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111021020007221) 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, 5046410000045 + ... + 5046410000066.

It is an arithmetic number, because the mean of its divisors is an integer number (30278460000336).

Almost surely, 2^{111021020001221} is an apocalyptic number.

111021020001221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111021020001221 is a deficient number, since it is larger than the sum of its proper divisors (10092820000123).

111021020001221 is a wasteful number, since it uses less digits than its factorization.

111021020001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10092820000122.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 111021020001221 its reverse (122100020120111), we get a palindrome (233121040121332).

The spelling of 111021020001221 in words is "one hundred eleven trillion, twenty-one billion, twenty million, one thousand, two hundred twenty-one".