21438152 has 12 divisors (see below), whose sum is σ = 40221105. Its totient is φ = 10712528.

The previous prime is 21438103. The next prime is 21438187. The reversal of 21438152 is 25183412.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 14394436 + 7043716 = 3794^2 + 2654^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=3274.

It is a super-2 number, since 2×21438152² = 919188722350208, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 11.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 12278 + ... + 13914.

Almost surely, 2^21438152 is an apocalyptic number.

It is an amenable number.

21438152 is a deficient number, since it is larger than the sum of its proper divisors (18782953).

21438152 is an frugal number, since it uses more digits than its factorization.

21438152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3280 (or 1639 counting only the distinct ones).

The product of its digits is 1920, while the sum is 26.

The square root of 21438152 is about 4630.1352032095. The cubic root of 21438152 is about 277.7980003529.

The spelling of 21438152 in words is "twenty-one million, four hundred thirty-eight thousand, one hundred fifty-two".