21272235 has 16 divisors (see below), whose sum is σ = 34866720. Its totient is φ = 11068160.

The previous prime is 21272213. The next prime is 21272269. The reversal of 21272235 is 53227212.

It is a happy number.

It is not a de Polignac number, because 21272235 - 2¹¹ = 21270187 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16680 + ... + 17909.

It is an arithmetic number, because the mean of its divisors is an integer number (2179170).

Almost surely, 2^21272235 is an apocalyptic number.

21272235 is a deficient number, since it is larger than the sum of its proper divisors (13594485).

21272235 is a wasteful number, since it uses less digits than its factorization.

21272235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34638.

The product of its digits is 1680, while the sum is 24.

The square root of 21272235 is about 4612.1833224624. The cubic root of 21272235 is about 277.0794864574.

Adding to 21272235 its reverse (53227212), we get a palindrome (74499447).

The spelling of 21272235 in words is "twenty-one million, two hundred seventy-two thousand, two hundred thirty-five".