121236345 has 32 divisors (see below), whose sum is σ = 218211840. Its totient is φ = 64653552.

The previous prime is 121236331. The next prime is 121236347. The reversal of 121236345 is 543632121.

121236345 is a `hidden beast` number, since 1 + 2 + 1 + 23 + 634 + 5 = 666.

It is not a de Polignac number, because 121236345 - 2⁴ = 121236329 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121236347) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5392 + ... + 16478.

It is an arithmetic number, because the mean of its divisors is an integer number (6819120).

Almost surely, 2^121236345 is an apocalyptic number.

121236345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121236345 is a deficient number, since it is larger than the sum of its proper divisors (96975495).

121236345 is an frugal number, since it uses more digits than its factorization.

121236345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11113 (or 11095 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 121236345 is about 11010.7377137047. The cubic root of 121236345 is about 494.9305687741.

Adding to 121236345 its reverse (543632121), we get a palindrome (664868466).

The spelling of 121236345 in words is "one hundred twenty-one million, two hundred thirty-six thousand, three hundred forty-five".