21150010 has 16 divisors (see below), whose sum is σ = 43508736. Its totient is φ = 7251408.

The previous prime is 21150001. The next prime is 21150011. The reversal of 21150010 is 1005112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (21150011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151002 + ... + 151141.

It is an arithmetic number, because the mean of its divisors is an integer number (2719296).

Almost surely, 2^21150010 is an apocalyptic number.

21150010 is an abundant number, since it is smaller than the sum of its proper divisors (22358726).

21150010 is a wasteful number, since it uses less digits than its factorization.

21150010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302157.

The product of its (nonzero) digits is 10, while the sum is 10.

The square root of 21150010 is about 4598.9140022401. The cubic root of 21150010 is about 276.5477900930.

Adding to 21150010 its reverse (1005112), we get a palindrome (22155122).

The spelling of 21150010 in words is "twenty-one million, one hundred fifty thousand, ten".