21611004210 has 48 divisors (see below), whose sum is σ = 56219080320. Its totient is φ = 5759809440.

The previous prime is 21611004179. The next prime is 21611004221. The reversal of 21611004210 is 1240011612.

21611004210 is a `hidden beast` number, since 2 + 1 + 611 + 0 + 0 + 42 + 10 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 104221 + ... + 232559.

It is an arithmetic number, because the mean of its divisors is an integer number (1171230840).

Almost surely, 2^21611004210 is an apocalyptic number.

21611004210 is an abundant number, since it is smaller than the sum of its proper divisors (34608076110).

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

21611004210 is a wasteful number, since it uses less digits than its factorization.

21611004210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130223 (or 130220 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21611004210 its reverse (1240011612), we get a palindrome (22851015822).

The spelling of 21611004210 in words is "twenty-one billion, six hundred eleven million, four thousand, two hundred ten".