21127452 has 24 divisors (see below), whose sum is σ = 49587216. Its totient is φ = 7001088.

The previous prime is 21127417. The next prime is 21127459. The reversal of 21127452 is 25472112.

It is a super-3 number, since 3×21127452³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21127459) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3013 + ... + 7164.

It is an arithmetic number, because the mean of its divisors is an integer number (2066134).

Almost surely, 2^21127452 is an apocalyptic number.

It is an amenable number.

21127452 is an abundant number, since it is smaller than the sum of its proper divisors (28459764).

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

21127452 is a wasteful number, since it uses less digits than its factorization.

21127452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10357 (or 10355 counting only the distinct ones).

The product of its digits is 1120, while the sum is 24.

The square root of 21127452 is about 4596.4608124077. The cubic root of 21127452 is about 276.4494357777.

Adding to 21127452 its reverse (25472112), we get a palindrome (46599564).

The spelling of 21127452 in words is "twenty-one million, one hundred twenty-seven thousand, four hundred fifty-two".