212240311421 has 16 divisors (see below), whose sum is σ = 227614472064. Its totient is φ = 197386098624.

The previous prime is 212240311403. The next prime is 212240311511. The reversal of 212240311421 is 124113042212.

It is not a de Polignac number, because 212240311421 - 2¹⁴ = 212240295037 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212240313421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1126991 + ... + 1301763.

It is an arithmetic number, because the mean of its divisors is an integer number (14225904504).

Almost surely, 2^212240311421 is an apocalyptic number.

It is an amenable number.

212240311421 is a deficient number, since it is larger than the sum of its proper divisors (15374160643).

212240311421 is a wasteful number, since it uses less digits than its factorization.

212240311421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176260.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 212240311421 its reverse (124113042212), we get a palindrome (336353353633).

The spelling of 212240311421 in words is "two hundred twelve billion, two hundred forty million, three hundred eleven thousand, four hundred twenty-one".