64121 has 4 divisors (see below), whose sum is σ = 65892. Its totient is φ = 62352.

The previous prime is 64109. The next prime is 64123. The reversal of 64121 is 12146.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12146 = 2 ⋅6073.

It can be written as a sum of positive squares in 2 ways, for example, as 44521 + 19600 = 211^2 + 140^2 .

It is a cyclic number.

It is not a de Polignac number, because 64121 - 2¹⁰ = 63097 is a prime.

It is a super-2 number, since 2×64121² = 8223005282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64096 and 64105.

It is not an unprimeable number, because it can be changed into a prime (64123) 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, 830 + ... + 903.

It is an arithmetic number, because the mean of its divisors is an integer number (16473).

2⁶⁴¹²¹ is an apocalyptic number.

It is an amenable number.

64121 is a deficient number, since it is larger than the sum of its proper divisors (1771).

64121 is a wasteful number, since it uses less digits than its factorization.

64121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1770.

The product of its digits is 48, while the sum is 14.

The square root of 64121 is about 253.2212471338. The cubic root of 64121 is about 40.0251924635.

Adding to 64121 its reverse (12146), we get a palindrome (76267).

It can be divided in two parts, 64 and 121, that multiplied together give a square (7744 = 88²).

The spelling of 64121 in words is "sixty-four thousand, one hundred twenty-one".