212010220210021 has 4 divisors (see below), whose sum is σ = 212010370668844. Its totient is φ = 212010069751200.

The previous prime is 212010220210013. The next prime is 212010220210037. The reversal of 212010220210021 is 120012022010212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9040762049796 + 202969458160225 = 3006786^2 + 14246735^2 .

It is a cyclic number.

It is not a de Polignac number, because 212010220210021 - 2³ = 212010220210013 is a prime.

It is a super-3 number, since 3×212010220210021³ (a number of 44 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212010220209977 and 212010220210004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212010220210121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73095600 + ... + 75940681.

It is an arithmetic number, because the mean of its divisors is an integer number (53002592667211).

Almost surely, 2^{212010220210021} is an apocalyptic number.

It is an amenable number.

212010220210021 is a deficient number, since it is larger than the sum of its proper divisors (150458823).

212010220210021 is a wasteful number, since it uses less digits than its factorization.

212010220210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150458822.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 212010220210021 its reverse (120012022010212), we get a palindrome (332022242220233).

The spelling of 212010220210021 in words is "two hundred twelve trillion, ten billion, two hundred twenty million, two hundred ten thousand, twenty-one".