212000002111021 has 4 divisors (see below), whose sum is σ = 212000041489500. Its totient is φ = 211999962732544.

The previous prime is 212000002110979. The next prime is 212000002111099. The reversal of 212000002111021 is 120111200000212.

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 98083550993796 + 113916451117225 = 9903714^2 + 10673165^2 .

It is a cyclic number.

It is not a de Polignac number, because 212000002111021 - 2³¹ = 211997854627373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212000002110992 and 212000002111010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212000002111421) 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, 10036246 + ... + 22906903.

It is an arithmetic number, because the mean of its divisors is an integer number (53000010372375).

Almost surely, 2^{212000002111021} is an apocalyptic number.

It is an amenable number.

212000002111021 is a deficient number, since it is larger than the sum of its proper divisors (39378479).

212000002111021 is an equidigital number, since it uses as much as digits as its factorization.

212000002111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39378478.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 212000002111021 its reverse (120111200000212), we get a palindrome (332111202111233).

The spelling of 212000002111021 in words is "two hundred twelve trillion, two million, one hundred eleven thousand, twenty-one".