1021111012221 has 8 divisors (see below), whose sum is σ = 1365338238720. Its totient is φ = 678812230272.

The previous prime is 1021111012219. The next prime is 1021111012267. The reversal of 1021111012221 is 1222101111201.

It is a happy number.

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

It is not a de Polignac number, because 1021111012221 - 2¹ = 1021111012219 is a prime.

It is a super-2 number, since 2×1021111012221² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1021111012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021111012021) 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, 482109901 + ... + 482112018.

It is an arithmetic number, because the mean of its divisors is an integer number (170667279840).

Almost surely, 2^{1021111012221} is an apocalyptic number.

It is an amenable number.

1021111012221 is a deficient number, since it is larger than the sum of its proper divisors (344227226499).

1021111012221 is an equidigital number, since it uses as much as digits as its factorization.

1021111012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964222275.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1021111012221 its reverse (1222101111201), we get a palindrome (2243212123422).

The spelling of 1021111012221 in words is "one trillion, twenty-one billion, one hundred eleven million, twelve thousand, two hundred twenty-one".