121247643 has 16 divisors (see below), whose sum is σ = 176679936. Its totient is φ = 73350240.

The previous prime is 121247629. The next prime is 121247653. The reversal of 121247643 is 346742121.

It is not a de Polignac number, because 121247643 - 2¹³ = 121239451 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121247643.

It is not an unprimeable number, because it can be changed into a prime (121247653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17005 + ... + 23057.

It is an arithmetic number, because the mean of its divisors is an integer number (11042496).

Almost surely, 2^121247643 is an apocalyptic number.

121247643 is a deficient number, since it is larger than the sum of its proper divisors (55432293).

121247643 is a wasteful number, since it uses less digits than its factorization.

121247643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6674.

The product of its digits is 8064, while the sum is 30.

The square root of 121247643 is about 11011.2507463957. The cubic root of 121247643 is about 494.9459424694.

Adding to 121247643 its reverse (346742121), we get a palindrome (467989764).

The spelling of 121247643 in words is "one hundred twenty-one million, two hundred forty-seven thousand, six hundred forty-three".