121343805 has 64 divisors (see below), whose sum is σ = 241194240. Its totient is φ = 57369600.

The previous prime is 121343753. The next prime is 121343809. The reversal of 121343805 is 508343121.

It is a happy number.

It is not a de Polignac number, because 121343805 - 2¹⁷ = 121212733 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121343809) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 59889 + ... + 61881.

It is an arithmetic number, because the mean of its divisors is an integer number (3768660).

Almost surely, 2^121343805 is an apocalyptic number.

121343805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121343805 is a deficient number, since it is larger than the sum of its proper divisors (119850435).

121343805 is a wasteful number, since it uses less digits than its factorization.

121343805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2059 (or 2053 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 121343805 is about 11015.6164148903. The cubic root of 121343805 is about 495.0767557742.

Adding to 121343805 its reverse (508343121), we get a palindrome (629686926).

The spelling of 121343805 in words is "one hundred twenty-one million, three hundred forty-three thousand, eight hundred five".