32400121 has 4 divisors (see below), whose sum is σ = 34892452. Its totient is φ = 29907792.

The previous prime is 32400103. The next prime is 32400131. The reversal of 32400121 is 12100423.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12100423 = 191 ⋅63353.

It can be written as a sum of positive squares in 2 ways, for example, as 7290000 + 25110121 = 2700^2 + 5011^2 .

It is a cyclic number.

It is not a de Polignac number, because 32400121 - 2¹³ = 32391929 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 2492317 = 32400121 / (3 + 2 + 4 + 0 + 0 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (32400131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1246146 + ... + 1246171.

It is an arithmetic number, because the mean of its divisors is an integer number (8723113).

Almost surely, 2^32400121 is an apocalyptic number.

It is an amenable number.

32400121 is a deficient number, since it is larger than the sum of its proper divisors (2492331).

32400121 is a wasteful number, since it uses less digits than its factorization.

32400121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2492330.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 32400121 is about 5692.1104170597. The cubic root of 32400121 is about 318.7979676113.

Adding to 32400121 its reverse (12100423), we get a palindrome (44500544).

It can be divided in two parts, 32400 and 121, that multiplied together give a square (3920400 = 1980²).

The spelling of 32400121 in words is "thirty-two million, four hundred thousand, one hundred twenty-one".