1021220202121 has 4 divisors (see below), whose sum is σ = 1167108802432. Its totient is φ = 875331601812.

The previous prime is 1021220202109. The next prime is 1021220202127. The reversal of 1021220202121 is 1212020221201.

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 1021220202121 - 2⁷ = 1021220201993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021220202095 and 1021220202104.

It is not an unprimeable number, because it can be changed into a prime (1021220202127) 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, 72944300145 + ... + 72944300158.

It is an arithmetic number, because the mean of its divisors is an integer number (291777200608).

Almost surely, 2^{1021220202121} is an apocalyptic number.

It is an amenable number.

1021220202121 is a deficient number, since it is larger than the sum of its proper divisors (145888600311).

1021220202121 is an equidigital number, since it uses as much as digits as its factorization.

1021220202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145888600310.

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

Adding to 1021220202121 its reverse (1212020221201), we get a palindrome (2233240423322).

The spelling of 1021220202121 in words is "one trillion, twenty-one billion, two hundred twenty million, two hundred two thousand, one hundred twenty-one".