21150006 has 32 divisors (see below), whose sum is σ = 45253728. Its totient is φ = 6566400.

The previous prime is 21150001. The next prime is 21150011. The reversal of 21150006 is 60005112.

It is an interprime number because it is at equal distance from previous prime (21150001) and next prime (21150011).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21150001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9276 + ... + 11328.

It is an arithmetic number, because the mean of its divisors is an integer number (1414179).

Almost surely, 2^21150006 is an apocalyptic number.

21150006 is an abundant number, since it is smaller than the sum of its proper divisors (24103722).

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

21150006 is a wasteful number, since it uses less digits than its factorization.

21150006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2176.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 21150006 is about 4598.9135673548. The cubic root of 21150006 is about 276.5477726589.

Adding to 21150006 its reverse (60005112), we get a palindrome (81155118).

The spelling of 21150006 in words is "twenty-one million, one hundred fifty thousand, six".