1020121101221 has 4 divisors (see below), whose sum is σ = 1020124882944. Its totient is φ = 1020117319500.

The previous prime is 1020121101199. The next prime is 1020121101227. The reversal of 1020121101221 is 1221011210201.

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 a de Polignac number, because none of the positive numbers 2^k-1020121101221 is a prime.

It is a super-2 number, since 2×1020121101221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1020121101196 and 1020121101205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020121101227) 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, 1452335 + ... + 2037036.

It is an arithmetic number, because the mean of its divisors is an integer number (255031220736).

Almost surely, 2^{1020121101221} is an apocalyptic number.

It is an amenable number.

1020121101221 is a deficient number, since it is larger than the sum of its proper divisors (3781723).

1020121101221 is an equidigital number, since it uses as much as digits as its factorization.

1020121101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3781722.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1020121101221 its reverse (1221011210201), we get a palindrome (2241132311422).

The spelling of 1020121101221 in words is "one trillion, twenty billion, one hundred twenty-one million, one hundred one thousand, two hundred twenty-one".