1321066125 has 64 divisors (see below), whose sum is σ = 2502339840. Its totient is φ = 687312000.

The previous prime is 1321066121. The next prime is 1321066139. The reversal of 1321066125 is 5216601231.

1321066125 is a `hidden beast` number, since 1 + 32 + 10 + 6 + 612 + 5 = 666.

It is not a de Polignac number, because 1321066125 - 2² = 1321066121 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321066121) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 133602 + ... + 143148.

It is an arithmetic number, because the mean of its divisors is an integer number (39099060).

Almost surely, 2^1321066125 is an apocalyptic number.

1321066125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1321066125 is a deficient number, since it is larger than the sum of its proper divisors (1181273715).

1321066125 is an equidigital number, since it uses as much as digits as its factorization.

1321066125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9612 (or 9596 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 1321066125 is about 36346.4733502440. The cubic root of 1321066125 is about 1097.2565587598.

Adding to 1321066125 its reverse (5216601231), we get a palindrome (6537667356).

The spelling of 1321066125 in words is "one billion, three hundred twenty-one million, sixty-six thousand, one hundred twenty-five".