21212100122010 has 96 divisors (see below), whose sum is σ = 59259610850112. Its totient is φ = 4845296010240.

The previous prime is 21212100121903. The next prime is 21212100122027. The reversal of 21212100122010 is 1022100121212.

It is a super-3 number, since 3×21212100122010³ (a number of 41 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2498551 + ... + 6976170.

It is an arithmetic number, because the mean of its divisors is an integer number (617287613022).

Almost surely, 2^{21212100122010} is an apocalyptic number.

21212100122010 is an abundant number, since it is smaller than the sum of its proper divisors (38047510728102).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21212100122010 is a wasteful number, since it uses less digits than its factorization.

21212100122010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9476268 (or 9476261 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21212100122010 its reverse (1022100121212), we get a palindrome (22234200243222).

The spelling of 21212100122010 in words is "twenty-one trillion, two hundred twelve billion, one hundred million, one hundred twenty-two thousand, ten".