21241206 has 36 divisors (see below), whose sum is σ = 53538732. Its totient is φ = 6068664.

The previous prime is 21241163. The next prime is 21241217. The reversal of 21241206 is 60214212.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 11160 + ... + 12923.

It is an arithmetic number, because the mean of its divisors is an integer number (1487187).

Almost surely, 2^21241206 is an apocalyptic number.

21241206 is an abundant number, since it is smaller than the sum of its proper divisors (32297526).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21241206 is a wasteful number, since it uses less digits than its factorization.

21241206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24105 (or 24095 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 21241206 is about 4608.8182867195. The cubic root of 21241206 is about 276.9446991308.

Adding to 21241206 its reverse (60214212), we get a palindrome (81455418).

The spelling of 21241206 in words is "twenty-one million, two hundred forty-one thousand, two hundred six".