21001100210210 has 16 divisors (see below), whose sum is σ = 37802266673976. Its totient is φ = 8400376462848.

The previous prime is 21001100210183. The next prime is 21001100210267. The reversal of 21001100210210 is 1201200110012.

It can be written as a sum of positive squares in 4 ways, for example, as 14946582298561 + 6054517911649 = 3866081^2 + 2460593^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21001100210191 and 21001100210200.

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 7 ways as a sum of consecutive naturals, for example, 6554549 + ... + 9217608.

Almost surely, 2^{21001100210210} is an apocalyptic number.

21001100210210 is a deficient number, since it is larger than the sum of its proper divisors (16801166463766).

21001100210210 is a wasteful number, since it uses less digits than its factorization.

21001100210210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15905317.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21001100210210 its reverse (1201200110012), we get a palindrome (22202300320222).

The spelling of 21001100210210 in words is "twenty-one trillion, one billion, one hundred million, two hundred ten thousand, two hundred ten".