21484231 has 16 divisors (see below), whose sum is σ = 23811840. Its totient is φ = 19293120.

The previous prime is 21484213. The next prime is 21484237. The reversal of 21484231 is 13248412.

It is a cyclic number.

It is not a de Polignac number, because 21484231 - 2⁹ = 21483719 is a prime.

It is a super-2 number, since 2×21484231² = 923144363322722, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 21484196 and 21484205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21484237) 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, 92091 + ... + 92323.

It is an arithmetic number, because the mean of its divisors is an integer number (1488240).

Almost surely, 2^21484231 is an apocalyptic number.

21484231 is the 2932-nd centered pentagonal number.

21484231 is a deficient number, since it is larger than the sum of its proper divisors (2327609).

21484231 is a wasteful number, since it uses less digits than its factorization.

21484231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486.

The product of its digits is 1536, while the sum is 25.

The square root of 21484231 is about 4635.1085208439. The cubic root of 21484231 is about 277.9968902228.

The spelling of 21484231 in words is "twenty-one million, four hundred eighty-four thousand, two hundred thirty-one".