1020121220111 has 4 divisors (see below), whose sum is σ = 1165852822992. Its totient is φ = 874389617232.

The previous prime is 1020121220101. The next prime is 1020121220137. The reversal of 1020121220111 is 1110221210201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1020121220111 - 2¹⁰ = 1020121219087 is a prime.

It is a super-3 number, since 3×1020121220111³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020121220101) 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, 72865801430 + ... + 72865801443.

It is an arithmetic number, because the mean of its divisors is an integer number (291463205748).

Almost surely, 2^{1020121220111} is an apocalyptic number.

1020121220111 is a deficient number, since it is larger than the sum of its proper divisors (145731602881).

1020121220111 is an equidigital number, since it uses as much as digits as its factorization.

1020121220111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145731602880.

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

Adding to 1020121220111 its reverse (1110221210201), we get a palindrome (2130342430312).

The spelling of 1020121220111 in words is "one trillion, twenty billion, one hundred twenty-one million, two hundred twenty thousand, one hundred eleven".