212102012121021 has 72 divisors (see below), whose sum is σ = 342279395172000. Its totient is φ = 125518799931840.

The previous prime is 212102012120983. The next prime is 212102012121121. The reversal of 212102012121021 is 120121210201212.

212102012121021 is a `hidden beast` number, since 2 + 1 + 210 + 201 + 21 + 210 + 21 = 666.

It is not a de Polignac number, because 212102012121021 - 2¹⁷ = 212102011989949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212102012120985 and 212102012121003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212102012121121) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 603709635 + ... + 604060863.

It is an arithmetic number, because the mean of its divisors is an integer number (4753880488500).

Almost surely, 2^{212102012121021} is an apocalyptic number.

It is an amenable number.

212102012121021 is a deficient number, since it is larger than the sum of its proper divisors (130177383050979).

212102012121021 is a wasteful number, since it uses less digits than its factorization.

212102012121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354631 (or 354585 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 212102012121021 its reverse (120121210201212), we get a palindrome (332223222322233).

The spelling of 212102012121021 in words is "two hundred twelve trillion, one hundred two billion, twelve million, one hundred twenty-one thousand, twenty-one".