1020121202221 has 4 divisors (see below), whose sum is σ = 1112859493344. Its totient is φ = 927382911100.

The previous prime is 1020121202207. The next prime is 1020121202237. The reversal of 1020121202221 is 1222021210201.

It is a happy number.

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 1020121202221 - 2¹⁷ = 1020121071149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020121202195 and 1020121202204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020121202281) 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, 46369145545 + ... + 46369145566.

It is an arithmetic number, because the mean of its divisors is an integer number (278214873336).

Almost surely, 2^{1020121202221} is an apocalyptic number.

1020121202221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1020121202221 is a deficient number, since it is larger than the sum of its proper divisors (92738291123).

1020121202221 is an equidigital number, since it uses as much as digits as its factorization.

1020121202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92738291122.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1020121202221 its reverse (1222021210201), we get a palindrome (2242142412422).

The spelling of 1020121202221 in words is "one trillion, twenty billion, one hundred twenty-one million, two hundred two thousand, two hundred twenty-one".