121743643 has 4 divisors (see below), whose sum is σ = 139135600. Its totient is φ = 104351688.

The previous prime is 121743619. The next prime is 121743649. The reversal of 121743643 is 346347121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346347121 = 37 ⋅9360733.

It is not a de Polignac number, because 121743643 - 2²¹ = 119646491 is a prime.

It is a super-2 number, since 2×121743643² = 29643029221822898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121743649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8695968 + ... + 8695981.

It is an arithmetic number, because the mean of its divisors is an integer number (34783900).

Almost surely, 2^121743643 is an apocalyptic number.

121743643 is a deficient number, since it is larger than the sum of its proper divisors (17391957).

121743643 is an equidigital number, since it uses as much as digits as its factorization.

121743643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17391956.

The product of its digits is 12096, while the sum is 31.

The square root of 121743643 is about 11033.7501784298. The cubic root of 121743643 is about 495.6199327301.

The spelling of 121743643 in words is "one hundred twenty-one million, seven hundred forty-three thousand, six hundred forty-three".