1212101220121 has 16 divisors (see below), whose sum is σ = 1391923972800. Its totient is φ = 1043886873600.

The previous prime is 1212101220023. The next prime is 1212101220149. The reversal of 1212101220121 is 1210221012121.

It is not a de Polignac number, because 1212101220121 - 2⁷ = 1212101219993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212101220095 and 1212101220104.

It is not an unprimeable number, because it can be changed into a prime (1212101220221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12787261 + ... + 12881701.

It is an arithmetic number, because the mean of its divisors is an integer number (86995248300).

Almost surely, 2^{1212101220121} is an apocalyptic number.

1212101220121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1212101220121 is a deficient number, since it is larger than the sum of its proper divisors (179822752679).

1212101220121 is a wasteful number, since it uses less digits than its factorization.

1212101220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155880.

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

Adding to 1212101220121 its reverse (1210221012121), we get a palindrome (2422322232242).

The spelling of 1212101220121 in words is "one trillion, two hundred twelve billion, one hundred one million, two hundred twenty thousand, one hundred twenty-one".