21202021100210 has 16 divisors (see below), whose sum is σ = 38166397911000. Its totient is φ = 8480195122176.

The previous prime is 21202021100177. The next prime is 21202021100231. The reversal of 21202021100210 is 1200112020212.

It can be written as a sum of positive squares in 4 ways, for example, as 13068362370361 + 8133658729849 = 3615019^2 + 2851957^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76519535 + ... + 76796114.

Almost surely, 2^{21202021100210} is an apocalyptic number.

21202021100210 is a deficient number, since it is larger than the sum of its proper divisors (16964376810790).

21202021100210 is a wasteful number, since it uses less digits than its factorization.

21202021100210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153329485.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21202021100210 its reverse (1200112020212), we get a palindrome (22402133120422).

The spelling of 21202021100210 in words is "twenty-one trillion, two hundred two billion, twenty-one million, one hundred thousand, two hundred ten".