212012211001021 has 4 divisors (see below), whose sum is σ = 212013735212700. Its totient is φ = 212010686789344.

The previous prime is 212012211001009. The next prime is 212012211001061. The reversal of 212012211001021 is 120100112210212.

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 147164800322500 + 64847410678521 = 12131150^2 + 8052789^2 .

It is a cyclic number.

It is not a de Polignac number, because 212012211001021 - 2⁹ = 212012211000509 is a prime.

It is a super-2 number, since 2×212012211001021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212012211000986 and 212012211001004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212012211001061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 761897176 + ... + 762175393.

It is an arithmetic number, because the mean of its divisors is an integer number (53003433803175).

Almost surely, 2^{212012211001021} is an apocalyptic number.

It is an amenable number.

212012211001021 is a deficient number, since it is larger than the sum of its proper divisors (1524211679).

212012211001021 is a wasteful number, since it uses less digits than its factorization.

212012211001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1524211678.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 212012211001021 its reverse (120100112210212), we get a palindrome (332112323211233).

The spelling of 212012211001021 in words is "two hundred twelve trillion, twelve billion, two hundred eleven million, one thousand, twenty-one".