21013006 has 8 divisors (see below), whose sum is σ = 36022320. Its totient is φ = 9005568.

The previous prime is 21012997. The next prime is 21013019. The reversal of 21013006 is 60031012.

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, 750451 + ... + 750478.

It is an arithmetic number, because the mean of its divisors is an integer number (4502790).

Almost surely, 2^21013006 is an apocalyptic number.

21013006 is a deficient number, since it is larger than the sum of its proper divisors (15009314).

21013006 is a wasteful number, since it uses less digits than its factorization.

21013006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1500938.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 21013006 is about 4583.9945462446. The cubic root of 21013006 is about 275.9493623407.

Adding to 21013006 its reverse (60031012), we get a palindrome (81044018).

The spelling of 21013006 in words is "twenty-one million, thirteen thousand, six".