21152434 has 12 divisors (see below), whose sum is σ = 33487614. Its totient is φ = 10019232.

The previous prime is 21152423. The next prime is 21152441. The reversal of 21152434 is 43425112.

It can be written as a sum of positive squares in only one way, i.e., 16378209 + 4774225 = 4047^2 + 2185^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13927 + ... + 15370.

Almost surely, 2^21152434 is an apocalyptic number.

21152434 is a deficient number, since it is larger than the sum of its proper divisors (12335180).

21152434 is a wasteful number, since it uses less digits than its factorization.

21152434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29337 (or 29318 counting only the distinct ones).

The product of its digits is 960, while the sum is 22.

The square root of 21152434 is about 4599.1775351687. The cubic root of 21152434 is about 276.5583547252.

Adding to 21152434 its reverse (43425112), we get a palindrome (64577546).

The spelling of 21152434 in words is "twenty-one million, one hundred fifty-two thousand, four hundred thirty-four".