121342252105 has 4 divisors (see below), whose sum is σ = 145610702532. Its totient is φ = 97073801680.

The previous prime is 121342252103. The next prime is 121342252121. The reversal of 121342252105 is 501252243121.

It is a happy number.

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 95790869001 + 25551383104 = 309501^2 + 159848^2 .

It is not a de Polignac number, because 121342252105 - 2¹ = 121342252103 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121342252103) 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, 12134225206 + ... + 12134225215.

It is an arithmetic number, because the mean of its divisors is an integer number (36402675633).

Almost surely, 2^121342252105 is an apocalyptic number.

It is an amenable number.

121342252105 is a deficient number, since it is larger than the sum of its proper divisors (24268450427).

121342252105 is an equidigital number, since it uses as much as digits as its factorization.

121342252105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24268450426.

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 121342252105 its reverse (501252243121), we get a palindrome (622594495226).

The spelling of 121342252105 in words is "one hundred twenty-one billion, three hundred forty-two million, two hundred fifty-two thousand, one hundred five".