12121370 has 16 divisors (see below), whose sum is σ = 21858120. Its totient is φ = 4839744.

The previous prime is 12121367. The next prime is 12121379. The reversal of 12121370 is 7312121.

It can be written as a sum of positive squares in 4 ways, for example, as 9728161 + 2393209 = 3119^2 + 1547^2 .

It is a super-2 number, since 2×12121370² = 293855221353800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12121379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10376 + ... + 11484.

Almost surely, 2^12121370 is an apocalyptic number.

12121370 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12121370 is a deficient number, since it is larger than the sum of its proper divisors (9736750).

12121370 is a wasteful number, since it uses less digits than its factorization.

12121370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2209.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 12121370 is about 3481.5757926548. The cubic root of 12121370 is about 229.7121161857.

Adding to 12121370 its reverse (7312121), we get a palindrome (19433491).

Subtracting from 12121370 its reverse (7312121), we obtain a square (4809249 = 2193²).

The spelling of 12121370 in words is "twelve million, one hundred twenty-one thousand, three hundred seventy".