121320232005 has 64 divisors (see below), whose sum is σ = 223513804800. Its totient is φ = 55043525376.

The previous prime is 121320231997. The next prime is 121320232013. The reversal of 121320232005 is 500232023121.

It is an interprime number because it is at equal distance from previous prime (121320231997) and next prime (121320232013).

It is not a de Polignac number, because 121320232005 - 2³ = 121320231997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 26015304 + ... + 26019966.

It is an arithmetic number, because the mean of its divisors is an integer number (3492403200).

Almost surely, 2^121320232005 is an apocalyptic number.

121320232005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121320232005 is a deficient number, since it is larger than the sum of its proper divisors (102193572795).

121320232005 is a wasteful number, since it uses less digits than its factorization.

121320232005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6490.

The product of its (nonzero) digits is 720, while the sum is 21.

Adding to 121320232005 its reverse (500232023121), we get a palindrome (621552255126).

The spelling of 121320232005 in words is "one hundred twenty-one billion, three hundred twenty million, two hundred thirty-two thousand, five".