12550021 has 4 divisors (see below), whose sum is σ = 13690944. Its totient is φ = 11409100.

The previous prime is 12550001. The next prime is 12550033. The reversal of 12550021 is 12005521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12005521 = 11 ⋅1091411.

It is a cyclic number.

It is not a de Polignac number, because 12550021 - 2¹³ = 12541829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12549977 and 12550004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12550001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 570445 + ... + 570466.

It is an arithmetic number, because the mean of its divisors is an integer number (3422736).

Almost surely, 2^12550021 is an apocalyptic number.

12550021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12550021 is a deficient number, since it is larger than the sum of its proper divisors (1140923).

12550021 is a wasteful number, since it uses less digits than its factorization.

12550021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1140922.

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

The square root of 12550021 is about 3542.6008807090. The cubic root of 12550021 is about 232.3885988840.

Adding to 12550021 its reverse (12005521), we get a palindrome (24555542).

It can be divided in two parts, 125500 and 21, that added together give a palindrome (125521).

The spelling of 12550021 in words is "twelve million, five hundred fifty thousand, twenty-one".