121647 has 16 divisors (see below), whose sum is σ = 177408. Its totient is φ = 73920.

The previous prime is 121637. The next prime is 121661. The reversal of 121647 is 746121.

It is not a de Polignac number, because 121647 - 2⁴ = 121631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121607) 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, 2808 + ... + 2850.

It is an arithmetic number, because the mean of its divisors is an integer number (11088).

2¹²¹⁶⁴⁷ is an apocalyptic number.

121647 is a deficient number, since it is larger than the sum of its proper divisors (55761).

121647 is a wasteful number, since it uses less digits than its factorization.

121647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110.

The product of its digits is 336, while the sum is 21.

The square root of 121647 is about 348.7792998445. The cubic root of 121647 is about 49.5488753049.

Adding to 121647 its reverse (746121), we get a palindrome (867768).

It can be divided in two parts, 121 and 647, that multiplied together give a palindrome (78287).

The spelling of 121647 in words is "one hundred twenty-one thousand, six hundred forty-seven".