1321210144 has 24 divisors (see below), whose sum is σ = 2738035440. Its totient is φ = 625836096.

The previous prime is 1321210123. The next prime is 1321210157. The reversal of 1321210144 is 4410121231.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1085914 + ... + 1087129.

It is an arithmetic number, because the mean of its divisors is an integer number (114084810).

Almost surely, 2^1321210144 is an apocalyptic number.

It is an amenable number.

1321210144 is an abundant number, since it is smaller than the sum of its proper divisors (1416825296).

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

1321210144 is a wasteful number, since it uses less digits than its factorization.

1321210144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2173072 (or 2173064 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 1321210144 is about 36348.4544925916. The cubic root of 1321210144 is about 1097.2964306095.

Adding to 1321210144 its reverse (4410121231), we get a palindrome (5731331375).

The spelling of 1321210144 in words is "one billion, three hundred twenty-one million, two hundred ten thousand, one hundred forty-four".