1111212120221 has 8 divisors (see below), whose sum is σ = 1269965631744. Its totient is φ = 952460839440.

The previous prime is 1111212120209. The next prime is 1111212120257. The reversal of 1111212120221 is 1220212121111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1111212120221 - 2²² = 1111207925917 is a prime.

It is a super-2 number, since 2×1111212120221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1111212120221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111212120121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 698351 + ... + 1646243.

It is an arithmetic number, because the mean of its divisors is an integer number (158745703968).

Almost surely, 2^{1111212120221} is an apocalyptic number.

It is an amenable number.

1111212120221 is a deficient number, since it is larger than the sum of its proper divisors (158753511523).

1111212120221 is an equidigital number, since it uses as much as digits as its factorization.

1111212120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1115371.

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

Adding to 1111212120221 its reverse (1220212121111), we get a palindrome (2331424241332).

The spelling of 1111212120221 in words is "one trillion, one hundred eleven billion, two hundred twelve million, one hundred twenty thousand, two hundred twenty-one".