121643445 has 32 divisors (see below), whose sum is σ = 242657280. Its totient is φ = 50552640.

The previous prime is 121643419. The next prime is 121643471. The reversal of 121643445 is 544346121.

It is an interprime number because it is at equal distance from previous prime (121643419) and next prime (121643471).

It is not a de Polignac number, because 121643445 - 2⁷ = 121643317 is a prime.

It is a super-2 number, since 2×121643445² = 29594255422936050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51505 + ... + 53814.

It is an arithmetic number, because the mean of its divisors is an integer number (7583040).

Almost surely, 2^121643445 is an apocalyptic number.

121643445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121643445 is a deficient number, since it is larger than the sum of its proper divisors (121013835).

121643445 is a wasteful number, since it uses less digits than its factorization.

121643445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105345.

The product of its digits is 11520, while the sum is 30.

The square root of 121643445 is about 11029.2087204840. The cubic root of 121643445 is about 495.4839262966.

Adding to 121643445 its reverse (544346121), we get a palindrome (665989566).

The spelling of 121643445 in words is "one hundred twenty-one million, six hundred forty-three thousand, four hundred forty-five".