21315010 has 32 divisors (see below), whose sum is σ = 39517632. Its totient is φ = 8274240.

The previous prime is 21315001. The next prime is 21315013. The reversal of 21315010 is 1051312.

It is not an unprimeable number, because it can be changed into a prime (21315013) 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, 69277 + ... + 69583.

It is an arithmetic number, because the mean of its divisors is an integer number (1234926).

Almost surely, 2^21315010 is an apocalyptic number.

21315010 is a deficient number, since it is larger than the sum of its proper divisors (18202622).

21315010 is a wasteful number, since it uses less digits than its factorization.

21315010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 21315010 is about 4616.8181683926. The cubic root of 21315010 is about 277.2650826848.

Adding to 21315010 its reverse (1051312), we get a palindrome (22366322).

The spelling of 21315010 in words is "twenty-one million, three hundred fifteen thousand, ten".