1321226580 has 24 divisors (see below), whose sum is σ = 3699434592. Its totient is φ = 352327072.

The previous prime is 1321226563. The next prime is 1321226581. The reversal of 1321226580 is 856221231.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321226581) 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, 11010162 + ... + 11010281.

It is an arithmetic number, because the mean of its divisors is an integer number (154143108).

Almost surely, 2^1321226580 is an apocalyptic number.

1321226580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321226580 is an abundant number, since it is smaller than the sum of its proper divisors (2378208012).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1321226580 is a wasteful number, since it uses less digits than its factorization.

1321226580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22020455 (or 22020453 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 1321226580 is about 36348.6805812811. The cubic root of 1321226580 is about 1097.3009807536.

The spelling of 1321226580 in words is "one billion, three hundred twenty-one million, two hundred twenty-six thousand, five hundred eighty".