21212100122210 has 8 divisors (see below), whose sum is σ = 38181780219996. Its totient is φ = 8484840048880.

The previous prime is 21212100122141. The next prime is 21212100122233. The reversal of 21212100122210 is 1222100121212.

It can be written as a sum of positive squares in 2 ways, for example, as 21093563829529 + 118536292681 = 4592773^2 + 344291^2 .

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

It is a super-3 number, since 3×21212100122210³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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, 1060605006101 + ... + 1060605006120.

Almost surely, 2^{21212100122210} is an apocalyptic number.

21212100122210 is a deficient number, since it is larger than the sum of its proper divisors (16969680097786).

21212100122210 is a wasteful number, since it uses less digits than its factorization.

21212100122210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2121210012228.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21212100122210 its reverse (1222100121212), we get a palindrome (22434200243422).

The spelling of 21212100122210 in words is "twenty-one trillion, two hundred twelve billion, one hundred million, one hundred twenty-two thousand, two hundred ten".