1212220112121 has 12 divisors (see below), whose sum is σ = 1798308515172. Its totient is φ = 786304937376.

The previous prime is 1212220112101. The next prime is 1212220112149. The reversal of 1212220112121 is 1212110222121.

1212220112121 is a `hidden beast` number, since 1 + 212 + 220 + 112 + 121 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 694955649600 + 517264462521 = 833640^2 + 719211^2 .

It is not a de Polignac number, because 1212220112121 - 2⁶ = 1212220112057 is a prime.

It is a super-2 number, since 2×1212220112121² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1212220112094 and 1212220112103.

It is not an unprimeable number, because it can be changed into a prime (1212220112101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1820149986 + ... + 1820150651.

It is an arithmetic number, because the mean of its divisors is an integer number (149859042931).

Almost surely, 2^{1212220112121} is an apocalyptic number.

It is an amenable number.

1212220112121 is a deficient number, since it is larger than the sum of its proper divisors (586088403051).

1212220112121 is a wasteful number, since it uses less digits than its factorization.

1212220112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3640300680 (or 3640300677 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1212220112121 its reverse (1212110222121), we get a palindrome (2424330334242).

The spelling of 1212220112121 in words is "one trillion, two hundred twelve billion, two hundred twenty million, one hundred twelve thousand, one hundred twenty-one".