212120202122021 has 4 divisors (see below), whose sum is σ = 212125555623072. Its totient is φ = 212114848620972.

The previous prime is 212120202121969. The next prime is 212120202122029. The reversal of 212120202122021 is 120221202021212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212120202122021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212120202121984 and 212120202122002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212120202122029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2676691091 + ... + 2676770336.

It is an arithmetic number, because the mean of its divisors is an integer number (53031388905768).

Almost surely, 2^{212120202122021} is an apocalyptic number.

It is an amenable number.

212120202122021 is a deficient number, since it is larger than the sum of its proper divisors (5353501051).

212120202122021 is an equidigital number, since it uses as much as digits as its factorization.

212120202122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5353501050.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 212120202122021 its reverse (120221202021212), we get a palindrome (332341404143233).

The spelling of 212120202122021 in words is "two hundred twelve trillion, one hundred twenty billion, two hundred two million, one hundred twenty-two thousand, twenty-one".