21100021210210 has 8 divisors (see below), whose sum is σ = 37980038178396. Its totient is φ = 8440008484080.

The previous prime is 21100021210087. The next prime is 21100021210237. The reversal of 21100021210210 is 1201212000112.

It can be written as a sum of positive squares in 2 ways, for example, as 20711409858441 + 388611351769 = 4550979^2 + 623387^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1055001060501 + ... + 1055001060520.

Almost surely, 2^{21100021210210} is an apocalyptic number.

21100021210210 is a deficient number, since it is larger than the sum of its proper divisors (16880016968186).

21100021210210 is a wasteful number, since it uses less digits than its factorization.

21100021210210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2110002121028.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21100021210210 its reverse (1201212000112), we get a palindrome (22301233210322).

The spelling of 21100021210210 in words is "twenty-one trillion, one hundred billion, twenty-one million, two hundred ten thousand, two hundred ten".