1308980021 has 4 divisors (see below), whose sum is σ = 1309101600. Its totient is φ = 1308858444.

The previous prime is 1308980017. The next prime is 1308980051. The reversal of 1308980021 is 1200898031.

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.

It is a cyclic number.

It is not a de Polignac number, because 1308980021 - 2² = 1308980017 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1308980021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1308980051) 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, 42881 + ... + 66758.

It is an arithmetic number, because the mean of its divisors is an integer number (327275400).

Almost surely, 2^1308980021 is an apocalyptic number.

It is an amenable number.

1308980021 is a deficient number, since it is larger than the sum of its proper divisors (121579).

1308980021 is a wasteful number, since it uses less digits than its factorization.

1308980021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121578.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 1308980021 is about 36179.8289244159. The cubic root of 1308980021 is about 1093.9001267409.

The spelling of 1308980021 in words is "one billion, three hundred eight million, nine hundred eighty thousand, twenty-one".