212110100101021 has 4 divisors (see below), whose sum is σ = 212122228319100. Its totient is φ = 212097971882944.

The previous prime is 212110100100979. The next prime is 212110100101037. The reversal of 212110100101021 is 120101001011212.

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 11053723181796 + 201056376919225 = 3324714^2 + 14179435^2 .

It is a cyclic number.

It is not a de Polignac number, because 212110100101021 - 2⁷ = 212110100100893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212110100100992 and 212110100101010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212110100191021) 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, 6064082806 + ... + 6064117783.

It is an arithmetic number, because the mean of its divisors is an integer number (53030557079775).

Almost surely, 2^{212110100101021} is an apocalyptic number.

It is an amenable number.

212110100101021 is a deficient number, since it is larger than the sum of its proper divisors (12128218079).

212110100101021 is a wasteful number, since it uses less digits than its factorization.

212110100101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12128218078.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 212110100101021 its reverse (120101001011212), we get a palindrome (332211101112233).

The spelling of 212110100101021 in words is "two hundred twelve trillion, one hundred ten billion, one hundred million, one hundred one thousand, twenty-one".