121210643 has 4 divisors (see below), whose sum is σ = 121530840. Its totient is φ = 120890448.

The previous prime is 121210619. The next prime is 121210657. The reversal of 121210643 is 346012121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121210643 - 2¹⁴ = 121194259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121210673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159530 + ... + 160287.

It is an arithmetic number, because the mean of its divisors is an integer number (30382710).

Almost surely, 2^121210643 is an apocalyptic number.

121210643 is a deficient number, since it is larger than the sum of its proper divisors (320197).

121210643 is an equidigital number, since it uses as much as digits as its factorization.

121210643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320196.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 121210643 is about 11009.5705184171. The cubic root of 121210643 is about 494.8955913518.

Adding to 121210643 its reverse (346012121), we get a palindrome (467222764).

The spelling of 121210643 in words is "one hundred twenty-one million, two hundred ten thousand, six hundred forty-three".