21275006 has 4 divisors (see below), whose sum is σ = 31912512. Its totient is φ = 10637502.

The previous prime is 21274999. The next prime is 21275017. The reversal of 21275006 is 60057212.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5318750 + ... + 5318753.

It is an arithmetic number, because the mean of its divisors is an integer number (7978128).

Almost surely, 2^21275006 is an apocalyptic number.

21275006 is a deficient number, since it is larger than the sum of its proper divisors (10637506).

21275006 is a wasteful number, since it uses less digits than its factorization.

21275006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10637505.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 21275006 is about 4612.4837127084. The cubic root of 21275006 is about 277.0915170679.

The spelling of 21275006 in words is "twenty-one million, two hundred seventy-five thousand, six".