1210121320 has 16 divisors (see below), whose sum is σ = 2722773060. Its totient is φ = 484048512.

The previous prime is 1210121317. The next prime is 1210121321. The reversal of 1210121320 is 231210121.

It can be written as a sum of positive squares in 2 ways, for example, as 1152330916 + 57790404 = 33946^2 + 7602^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1210121320.

It is not an unprimeable number, because it can be changed into a prime (1210121321) 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, 15126477 + ... + 15126556.

Almost surely, 2^1210121320 is an apocalyptic number.

1210121320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1210121320 is an abundant number, since it is smaller than the sum of its proper divisors (1512651740).

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

1210121320 is a wasteful number, since it uses less digits than its factorization.

1210121320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30253044 (or 30253040 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1210121320 is about 34786.7980705324. The cubic root of 1210121320 is about 1065.6378495883.

Adding to 1210121320 its reverse (231210121), we get a palindrome (1441331441).

The spelling of 1210121320 in words is "one billion, two hundred ten million, one hundred twenty-one thousand, three hundred twenty".