121761231345 has 64 divisors (see below), whose sum is σ = 233308131840. Its totient is φ = 59894463744.

The previous prime is 121761231343. The next prime is 121761231401. The reversal of 121761231345 is 543132167121.

121761231345 is a `hidden beast` number, since 1 + 2 + 1 + 7 + 612 + 3 + 1 + 34 + 5 = 666.

It is not a de Polignac number, because 121761231345 - 2¹ = 121761231343 is a prime.

It is a super-2 number, since 2×121761231345² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121761231343) 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 63 ways as a sum of consecutive naturals, for example, 2142892 + ... + 2198978.

It is an arithmetic number, because the mean of its divisors is an integer number (3645439560).

Almost surely, 2^121761231345 is an apocalyptic number.

121761231345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121761231345 is a deficient number, since it is larger than the sum of its proper divisors (111546900495).

121761231345 is a wasteful number, since it uses less digits than its factorization.

121761231345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57351 (or 57345 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

Adding to 121761231345 its reverse (543132167121), we get a palindrome (664893398466).

The spelling of 121761231345 in words is "one hundred twenty-one billion, seven hundred sixty-one million, two hundred thirty-one thousand, three hundred forty-five".