21612010 has 32 divisors (see below), whose sum is σ = 45411840. Its totient is φ = 7251072.

The previous prime is 21611999. The next prime is 21612011. The reversal of 21612010 is 1021612.

It is not an unprimeable number, because it can be changed into a prime (21612011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6 + ... + 6574.

It is an arithmetic number, because the mean of its divisors is an integer number (1419120).

Almost surely, 2^21612010 is an apocalyptic number.

21612010 is an abundant number, since it is smaller than the sum of its proper divisors (23799830).

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

21612010 is a wasteful number, since it uses less digits than its factorization.

21612010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6630.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 21612010 is about 4648.8719061725. The cubic root of 21612010 is about 278.5469366401.

Adding to 21612010 its reverse (1021612), we get a palindrome (22633622).

The spelling of 21612010 in words is "twenty-one million, six hundred twelve thousand, ten".