21011321210 has 32 divisors (see below), whose sum is σ = 41265303552. Its totient is φ = 7639238080.

The previous prime is 21011321197. The next prime is 21011321231. The reversal of 21011321210 is 1212311012.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 917864 + ... + 940476.

It is an arithmetic number, because the mean of its divisors is an integer number (1289540736).

Almost surely, 2^21011321210 is an apocalyptic number.

21011321210 is a deficient number, since it is larger than the sum of its proper divisors (20253982342).

21011321210 is a wasteful number, since it uses less digits than its factorization.

21011321210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31078.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21011321210 its reverse (1212311012), we get a palindrome (22223632222).

The spelling of 21011321210 in words is "twenty-one billion, eleven million, three hundred twenty-one thousand, two hundred ten".