121643701 has 4 divisors (see below), whose sum is σ = 121673772. Its totient is φ = 121613632.

The previous prime is 121643677. The next prime is 121643729. The reversal of 121643701 is 107346121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 107346121 = 179 ⋅599699.

It can be written as a sum of positive squares in 2 ways, for example, as 66438801 + 55204900 = 8151^2 + 7430^2 .

It is a cyclic number.

It is not a de Polignac number, because 121643701 - 2¹³ = 121635509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121641701) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 7810 + ... + 17443.

It is an arithmetic number, because the mean of its divisors is an integer number (30418443).

Almost surely, 2^121643701 is an apocalyptic number.

It is an amenable number.

121643701 is a deficient number, since it is larger than the sum of its proper divisors (30071).

121643701 is an equidigital number, since it uses as much as digits as its factorization.

121643701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30070.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 121643701 is about 11029.2203260249. The cubic root of 121643701 is about 495.4842738802.

Adding to 121643701 its reverse (107346121), we get a palindrome (228989822).

The spelling of 121643701 in words is "one hundred twenty-one million, six hundred forty-three thousand, seven hundred one".