121230405 has 32 divisors (see below), whose sum is σ = 216251520. Its totient is φ = 64437120.

The previous prime is 121230397. The next prime is 121230409. The reversal of 121230405 is 504032121.

It is not a de Polignac number, because 121230405 - 2³ = 121230397 is a prime.

It is a super-2 number, since 2×121230405² = 29393622192928050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121230409) 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, 43329 + ... + 46041.

It is an arithmetic number, because the mean of its divisors is an integer number (6757860).

Almost surely, 2^121230405 is an apocalyptic number.

121230405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121230405 is a deficient number, since it is larger than the sum of its proper divisors (95021115).

121230405 is a wasteful number, since it uses less digits than its factorization.

121230405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3058 (or 3052 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 121230405 is about 11010.4679737057. The cubic root of 121230405 is about 494.9224855666.

Adding to 121230405 its reverse (504032121), we get a palindrome (625262526).

The spelling of 121230405 in words is "one hundred twenty-one million, two hundred thirty thousand, four hundred five".