121045405 has 12 divisors (see below), whose sum is σ = 157288500. Its totient is φ = 89386752.

The previous prime is 121045381. The next prime is 121045417. The reversal of 121045405 is 504540121.

It can be written as a sum of positive squares in 6 ways, for example, as 28366276 + 92679129 = 5326^2 + 9627^2 .

It is not a de Polignac number, because 121045405 - 2⁵ = 121045373 is a prime.

It is a super-2 number, since 2×121045405² = 29303980143228050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70780 + ... + 72469.

It is an arithmetic number, because the mean of its divisors is an integer number (13107375).

Almost surely, 2^121045405 is an apocalyptic number.

It is an amenable number.

121045405 is a deficient number, since it is larger than the sum of its proper divisors (36243095).

121045405 is a wasteful number, since it uses less digits than its factorization.

121045405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143280 (or 143267 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 121045405 is about 11002.0636700575. The cubic root of 121045405 is about 494.6706035578.

Adding to 121045405 its reverse (504540121), we get a palindrome (625585526).

The spelling of 121045405 in words is "one hundred twenty-one million, forty-five thousand, four hundred five".