21450232 has 16 divisors (see below), whose sum is σ = 41306760. Its totient is φ = 10435104.

The previous prime is 21450229. The next prime is 21450239. The reversal of 21450232 is 23205412.

It is a super-2 number, since 2×21450232² = 920224905707648, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21450239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35938 + ... + 36529.

Almost surely, 2^21450232 is an apocalyptic number.

It is an amenable number.

21450232 is a deficient number, since it is larger than the sum of its proper divisors (19856528).

21450232 is a wasteful number, since it uses less digits than its factorization.

21450232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72510 (or 72506 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 21450232 is about 4631.4395170400. The cubic root of 21450232 is about 277.8501685580.

Adding to 21450232 its reverse (23205412), we get a palindrome (44655644).

The spelling of 21450232 in words is "twenty-one million, four hundred fifty thousand, two hundred thirty-two".