121423455 has 72 divisors (see below), whose sum is σ = 227393712. Its totient is φ = 62145792.

The previous prime is 121423453. The next prime is 121423457. The reversal of 121423455 is 554324121.

It is an interprime number because it is at equal distance from previous prime (121423453) and next prime (121423457).

It is not a de Polignac number, because 121423455 - 2¹ = 121423453 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 (121423451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1663299 + ... + 1663371.

It is an arithmetic number, because the mean of its divisors is an integer number (3158246).

Almost surely, 2^121423455 is an apocalyptic number.

121423455 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121423455 is a deficient number, since it is larger than the sum of its proper divisors (105970257).

121423455 is an frugal number, since it uses more digits than its factorization.

121423455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167 (or 118 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 121423455 is about 11019.2311437777. The cubic root of 121423455 is about 495.1850547760.

Adding to 121423455 its reverse (554324121), we get a palindrome (675747576).

The spelling of 121423455 in words is "one hundred twenty-one million, four hundred twenty-three thousand, four hundred fifty-five".