1212511212051 has 4 divisors (see below), whose sum is σ = 1616681616072. Its totient is φ = 808340808032.

The previous prime is 1212511212041. The next prime is 1212511212061. The reversal of 1212511212051 is 1502121152121.

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

It is an interprime number because it is at equal distance from previous prime (1212511212041) and next prime (1212511212061).

It is a cyclic number.

It is not a de Polignac number, because 1212511212051 - 2⁹ = 1212511211539 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1212511212041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202085202006 + ... + 202085202011.

It is an arithmetic number, because the mean of its divisors is an integer number (404170404018).

Almost surely, 2^{1212511212051} is an apocalyptic number.

1212511212051 is a deficient number, since it is larger than the sum of its proper divisors (404170404021).

1212511212051 is an equidigital number, since it uses as much as digits as its factorization.

1212511212051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404170404020.

The product of its (nonzero) digits is 400, while the sum is 24.

Adding to 1212511212051 its reverse (1502121152121), we get a palindrome (2714632364172).

The spelling of 1212511212051 in words is "one trillion, two hundred twelve billion, five hundred eleven million, two hundred twelve thousand, fifty-one".