21432026 has 16 divisors (see below), whose sum is σ = 40080960. Its totient is φ = 8350080.

The previous prime is 21432023. The next prime is 21432077. The reversal of 21432026 is 62023412.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21431989 and 21432007.

It is not an unprimeable number, because it can be changed into a prime (21432023) 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, 69431 + ... + 69738.

It is an arithmetic number, because the mean of its divisors is an integer number (2505060).

Almost surely, 2^21432026 is an apocalyptic number.

21432026 is a deficient number, since it is larger than the sum of its proper divisors (18648934).

21432026 is a wasteful number, since it uses less digits than its factorization.

21432026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139189.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 21432026 is about 4629.4736201862. The cubic root of 21432026 is about 277.7715373650.

Adding to 21432026 its reverse (62023412), we get a palindrome (83455438).

The spelling of 21432026 in words is "twenty-one million, four hundred thirty-two thousand, twenty-six".