21526436 has 12 divisors (see below), whose sum is σ = 39309312. Its totient is φ = 10295208.

The previous prime is 21526429. The next prime is 21526441. The reversal of 21526436 is 63462512.

It is a junction number, because it is equal to n+sod(n) for n = 21526399 and 21526408.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116900 + ... + 117083.

It is an arithmetic number, because the mean of its divisors is an integer number (3275776).

Almost surely, 2^21526436 is an apocalyptic number.

It is an amenable number.

21526436 is a deficient number, since it is larger than the sum of its proper divisors (17782876).

21526436 is a wasteful number, since it uses less digits than its factorization.

21526436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234010 (or 234008 counting only the distinct ones).

The product of its digits is 8640, while the sum is 29.

The square root of 21526436 is about 4639.6590391967. The cubic root of 21526436 is about 278.1788094515.

Adding to 21526436 its reverse (63462512), we get a palindrome (84988948).

The spelling of 21526436 in words is "twenty-one million, five hundred twenty-six thousand, four hundred thirty-six".