21282236 has 12 divisors (see below), whose sum is σ = 37297512. Its totient is φ = 10625808.

The previous prime is 21282221. The next prime is 21282241. The reversal of 21282236 is 63228212.

It is a super-3 number, since 3×21282236³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

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, 350 + ... + 6533.

It is an arithmetic number, because the mean of its divisors is an integer number (3108126).

Almost surely, 2^21282236 is an apocalyptic number.

It is an amenable number.

21282236 is a deficient number, since it is larger than the sum of its proper divisors (16015276).

21282236 is a wasteful number, since it uses less digits than its factorization.

21282236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7660 (or 7658 counting only the distinct ones).

The product of its digits is 2304, while the sum is 26.

The square root of 21282236 is about 4613.2673887387. The cubic root of 21282236 is about 277.1229020143.

The spelling of 21282236 in words is "twenty-one million, two hundred eighty-two thousand, two hundred thirty-six".