121423665 has 16 divisors (see below), whose sum is σ = 211939776. Its totient is φ = 58872000.

The previous prime is 121423651. The next prime is 121423777. The reversal of 121423665 is 566324121.

It is not a de Polignac number, because 121423665 - 2⁸ = 121423409 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 367786 + ... + 368115.

It is an arithmetic number, because the mean of its divisors is an integer number (13246236).

Almost surely, 2^121423665 is an apocalyptic number.

121423665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121423665 is a deficient number, since it is larger than the sum of its proper divisors (90516111).

121423665 is a wasteful number, since it uses less digits than its factorization.

121423665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735920.

The product of its digits is 8640, while the sum is 30.

The square root of 121423665 is about 11019.2406725690. The cubic root of 121423665 is about 495.1853402474.

Adding to 121423665 its reverse (566324121), we get a palindrome (687747786).

The spelling of 121423665 in words is "one hundred twenty-one million, four hundred twenty-three thousand, six hundred sixty-five".