121642455 has 32 divisors (see below), whose sum is σ = 215251200. Its totient is φ = 58164480.

The previous prime is 121642397. The next prime is 121642459. The reversal of 121642455 is 554246121.

It is not a de Polignac number, because 121642455 - 2¹⁰ = 121641431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121642459) 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, 6996 + ... + 17094.

It is an arithmetic number, because the mean of its divisors is an integer number (6726600).

Almost surely, 2^121642455 is an apocalyptic number.

121642455 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121642455 is a deficient number, since it is larger than the sum of its proper divisors (93608745).

121642455 is a wasteful number, since it uses less digits than its factorization.

121642455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10191.

The product of its digits is 9600, while the sum is 30.

The square root of 121642455 is about 11029.1638395664. The cubic root of 121642455 is about 495.4825821211.

Adding to 121642455 its reverse (554246121), we get a palindrome (675888576).

The spelling of 121642455 in words is "one hundred twenty-one million, six hundred forty-two thousand, four hundred fifty-five".