12021550 has 24 divisors (see below), whose sum is σ = 23677056. Its totient is φ = 4525440.

The previous prime is 12021539. The next prime is 12021551. The reversal of 12021550 is 5512021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6222 + ... + 7921.

It is an arithmetic number, because the mean of its divisors is an integer number (986544).

Almost surely, 2^12021550 is an apocalyptic number.

12021550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12021550 is a deficient number, since it is larger than the sum of its proper divisors (11655506).

12021550 is a wasteful number, since it uses less digits than its factorization.

12021550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14172 (or 14167 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 12021550 is about 3467.2106944920. The cubic root of 12021550 is about 229.0798142870.

Adding to 12021550 its reverse (5512021), we get a palindrome (17533571).

The spelling of 12021550 in words is "twelve million, twenty-one thousand, five hundred fifty".