21325006 has 8 divisors (see below), whose sum is σ = 32085144. Its totient is φ = 10629960.

The previous prime is 21324983. The next prime is 21325013. The reversal of 21325006 is 60052312.

21325006 = T₃₇₆₉ + T₃₇₇₀ + T₃₇₇₁.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 15445 + ... + 16768.

It is an arithmetic number, because the mean of its divisors is an integer number (4010643).

Almost surely, 2^21325006 is an apocalyptic number.

21325006 is the 3771-st centered triangular number.

21325006 is a deficient number, since it is larger than the sum of its proper divisors (10760138).

21325006 is a wasteful number, since it uses less digits than its factorization.

21325006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32546.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 21325006 is about 4617.9006052534. The cubic root of 21325006 is about 277.3084184785.

Adding to 21325006 its reverse (60052312), we get a palindrome (81377318).

The spelling of 21325006 in words is "twenty-one million, three hundred twenty-five thousand, six".