660241421 has 4 divisors (see below), whose sum is σ = 754561632. Its totient is φ = 565921212.

The previous prime is 660241403. The next prime is 660241423. The reversal of 660241421 is 124142066.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 124142066 = 2 ⋅62071033.

It is a cyclic number.

It is not a de Polignac number, because 660241421 - 2¹⁴ = 660225037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660241423) 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, 47160095 + ... + 47160108.

It is an arithmetic number, because the mean of its divisors is an integer number (188640408).

Almost surely, 2^660241421 is an apocalyptic number.

It is an amenable number.

660241421 is a deficient number, since it is larger than the sum of its proper divisors (94320211).

660241421 is an equidigital number, since it uses as much as digits as its factorization.

660241421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94320210.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 660241421 is about 25695.1633775697. The cubic root of 660241421 is about 870.7649154238.

Adding to 660241421 its reverse (124142066), we get a palindrome (784383487).

The spelling of 660241421 in words is "six hundred sixty million, two hundred forty-one thousand, four hundred twenty-one".