1212151512121 has 4 divisors (see below), whose sum is σ = 1322347104144. Its totient is φ = 1101955920100.

The previous prime is 1212151512109. The next prime is 1212151512137.

1212151512121 is nontrivially palindromic in base 10.

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 not a de Polignac number, because 1212151512121 - 2⁷ = 1212151511993 is a prime.

It is a super-2 number, since 2×1212151512121² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1212151512191) 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, 55097795995 + ... + 55097796016.

It is an arithmetic number, because the mean of its divisors is an integer number (330586776036).

Almost surely, 2^{1212151512121} is an apocalyptic number.

1212151512121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1212151512121 is a deficient number, since it is larger than the sum of its proper divisors (110195592023).

1212151512121 is a wasteful number, since it uses less digits than its factorization.

1212151512121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110195592022.

The product of its digits is 400, while the sum is 25.

The spelling of 1212151512121 in words is "one trillion, two hundred twelve billion, one hundred fifty-one million, five hundred twelve thousand, one hundred twenty-one".