212001011021 has 4 divisors (see below), whose sum is σ = 218839753344. Its totient is φ = 205162268700.

The previous prime is 212001010999. The next prime is 212001011111. The reversal of 212001011021 is 120110100212.

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 not a de Polignac number, because 212001011021 - 2¹⁸ = 212000748877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212001010993 and 212001011011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212001011821) 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, 3419371115 + ... + 3419371176.

It is an arithmetic number, because the mean of its divisors is an integer number (54709938336).

Almost surely, 2^212001011021 is an apocalyptic number.

It is an amenable number.

212001011021 is a deficient number, since it is larger than the sum of its proper divisors (6838742323).

212001011021 is an equidigital number, since it uses as much as digits as its factorization.

212001011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6838742322.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 212001011021 its reverse (120110100212), we get a palindrome (332111111233).

The spelling of 212001011021 in words is "two hundred twelve billion, one million, eleven thousand, twenty-one".