120121220011021 has 4 divisors (see below), whose sum is σ = 120189743241532. Its totient is φ = 120052696780512.

The previous prime is 120121220011019. The next prime is 120121220011087. The reversal of 120121220011021 is 120110022121021.

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

It can be written as a sum of positive squares in 2 ways, for example, as 62801345572900 + 57319874438121 = 7924730^2 + 7570989^2 .

It is a cyclic number.

It is not a de Polignac number, because 120121220011021 - 2¹ = 120121220011019 is a prime.

It is a super-2 number, since 2×120121220011021² (a number of 29 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 = 120121220010986 and 120121220011004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120121220012021) 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, 34261612626 + ... + 34261616131.

It is an arithmetic number, because the mean of its divisors is an integer number (30047435810383).

Almost surely, 2^{120121220011021} is an apocalyptic number.

It is an amenable number.

120121220011021 is a deficient number, since it is larger than the sum of its proper divisors (68523230511).

120121220011021 is an equidigital number, since it uses as much as digits as its factorization.

120121220011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68523230510.

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

Adding to 120121220011021 its reverse (120110022121021), we get a palindrome (240231242132042).

The spelling of 120121220011021 in words is "one hundred twenty trillion, one hundred twenty-one billion, two hundred twenty million, eleven thousand, twenty-one".