12554421 has 16 divisors (see below), whose sum is σ = 19223040. Its totient is φ = 7207920.

The previous prime is 12554387. The next prime is 12554447. The reversal of 12554421 is 12445521.

It is not a de Polignac number, because 12554421 - 2⁹ = 12553909 is a prime.

It is a super-2 number, since 2×12554421² = 315226973290482, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12554391 and 12554400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12554461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9385 + ... + 10638.

It is an arithmetic number, because the mean of its divisors is an integer number (1201440).

Almost surely, 2^12554421 is an apocalyptic number.

12554421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12554421 is a deficient number, since it is larger than the sum of its proper divisors (6668619).

12554421 is a wasteful number, since it uses less digits than its factorization.

12554421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20056.

The product of its digits is 1600, while the sum is 24.

The square root of 12554421 is about 3543.2218389483. The cubic root of 12554421 is about 232.4157539610.

Adding to 12554421 its reverse (12445521), we get a palindrome (24999942).

Subtracting from 12554421 its reverse (12445521), we obtain a square (108900 = 330²).

The spelling of 12554421 in words is "twelve million, five hundred fifty-four thousand, four hundred twenty-one".