21315050 has 12 divisors (see below), whose sum is σ = 39646086. Its totient is φ = 8526000.

The previous prime is 21315037. The next prime is 21315053. The reversal of 21315050 is 5051312.

It can be written as a sum of positive squares in 3 ways, for example, as 20313049 + 1002001 = 4507^2 + 1001^2 .

It is not an unprimeable number, because it can be changed into a prime (21315053) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 213101 + ... + 213200.

Almost surely, 2^21315050 is an apocalyptic number.

21315050 is a deficient number, since it is larger than the sum of its proper divisors (18331036).

21315050 is a wasteful number, since it uses less digits than its factorization.

21315050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426313 (or 426308 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 21315050 is about 4616.8225003784. The cubic root of 21315050 is about 277.2652561244.

Adding to 21315050 its reverse (5051312), we get a palindrome (26366362).

The spelling of 21315050 in words is "twenty-one million, three hundred fifteen thousand, fifty".