21041610 has 32 divisors (see below), whose sum is σ = 51734592. Its totient is φ = 5473920.

The previous prime is 21041609. The next prime is 21041621. The reversal of 21041610 is 1614012.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21041610.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7324 + ... + 9783.

It is an arithmetic number, because the mean of its divisors is an integer number (1616706).

Almost surely, 2^21041610 is an apocalyptic number.

21041610 is an abundant number, since it is smaller than the sum of its proper divisors (30692982).

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

21041610 is a wasteful number, since it uses less digits than its factorization.

21041610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17158.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 21041610 is about 4587.1134714546. The cubic root of 21041610 is about 276.0745177912.

Adding to 21041610 its reverse (1614012), we get a palindrome (22655622).

The spelling of 21041610 in words is "twenty-one million, forty-one thousand, six hundred ten".