1021022111221 has 4 divisors (see below), whose sum is σ = 1166882412832. Its totient is φ = 875161809612.

The previous prime is 1021022111209. The next prime is 1021022111257. The reversal of 1021022111221 is 1221112201201.

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 1021022111221 - 2¹⁷ = 1021021980149 is a prime.

It is a super-2 number, since 2×1021022111221² (a number of 25 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 = 1021022111195 and 1021022111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021022141221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72930150795 + ... + 72930150808.

It is an arithmetic number, because the mean of its divisors is an integer number (291720603208).

Almost surely, 2^{1021022111221} is an apocalyptic number.

It is an amenable number.

1021022111221 is a deficient number, since it is larger than the sum of its proper divisors (145860301611).

1021022111221 is an equidigital number, since it uses as much as digits as its factorization.

1021022111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145860301610.

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

Adding to 1021022111221 its reverse (1221112201201), we get a palindrome (2242134312422).

The spelling of 1021022111221 in words is "one trillion, twenty-one billion, twenty-two million, one hundred eleven thousand, two hundred twenty-one".