21452206 has 4 divisors (see below), whose sum is σ = 32178312. Its totient is φ = 10726102.

The previous prime is 21452203. The next prime is 21452209. The reversal of 21452206 is 60225412.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21452203) and next prime (21452209).

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21452201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5363050 + ... + 5363053.

It is an arithmetic number, because the mean of its divisors is an integer number (8044578).

Almost surely, 2^21452206 is an apocalyptic number.

21452206 is a deficient number, since it is larger than the sum of its proper divisors (10726106).

21452206 is a wasteful number, since it uses less digits than its factorization.

21452206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10726105.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 21452206 is about 4631.6526208255. The cubic root of 21452206 is about 277.8586915336.

Adding to 21452206 its reverse (60225412), we get a palindrome (81677618).

The spelling of 21452206 in words is "twenty-one million, four hundred fifty-two thousand, two hundred six".