56121 has 8 divisors (see below), whose sum is σ = 80640. Its totient is φ = 34512.

The previous prime is 56113. The next prime is 56123. The reversal of 56121 is 12165.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 56121 - 2³ = 56113 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 56121.

It is not an unprimeable number, because it can be changed into a prime (56123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 681 + ... + 758.

It is an arithmetic number, because the mean of its divisors is an integer number (10080).

2⁵⁶¹²¹ is an apocalyptic number.

It is an amenable number.

56121 is a deficient number, since it is larger than the sum of its proper divisors (24519).

56121 is a wasteful number, since it uses less digits than its factorization.

56121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1455.

The product of its digits is 60, while the sum is 15.

The square root of 56121 is about 236.8987125334. The cubic root of 56121 is about 38.2861591511.

Adding to 56121 its reverse (12165), we get a palindrome (68286).

Subtracting from 56121 its reverse (12165), we obtain a triangular number (43956 = T₂₉₆).

It can be divided in two parts, 561 and 21, that multiplied together give a triangular number (11781 = T₁₅₃).

The spelling of 56121 in words is "fifty-six thousand, one hundred twenty-one".