212120231220021 has 8 divisors (see below), whose sum is σ = 283093541387424. Its totient is φ = 141280204266320.

The previous prime is 212120231220013. The next prime is 212120231220041. The reversal of 212120231220021 is 120022132021212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212120231220021 - 2³ = 212120231220013 is a prime.

It is a super-2 number, since 2×212120231220021² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 212120231220021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212120231220041) 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 7 ways as a sum of consecutive naturals, for example, 33320799711 + ... + 33320806076.

It is an arithmetic number, because the mean of its divisors is an integer number (35386692673428).

Almost surely, 2^{212120231220021} is an apocalyptic number.

It is an amenable number.

212120231220021 is a deficient number, since it is larger than the sum of its proper divisors (70973310167403).

212120231220021 is a wasteful number, since it uses less digits than its factorization.

212120231220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66641606851.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 212120231220021 its reverse (120022132021212), we get a palindrome (332142363241233).

The spelling of 212120231220021 in words is "two hundred twelve trillion, one hundred twenty billion, two hundred thirty-one million, two hundred twenty thousand, twenty-one".