212021612405 has 8 divisors (see below), whose sum is σ = 256429289472. Its totient is φ = 168281720208.

The previous prime is 212021612347. The next prime is 212021612419. The reversal of 212021612405 is 504216120212.

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 212021612405 - 2²⁰ = 212020563829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166945517 + ... + 166946786.

It is an arithmetic number, because the mean of its divisors is an integer number (32053661184).

Almost surely, 2^212021612405 is an apocalyptic number.

It is an amenable number.

212021612405 is a deficient number, since it is larger than the sum of its proper divisors (44407677067).

212021612405 is a wasteful number, since it uses less digits than its factorization.

212021612405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333892435.

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 212021612405 its reverse (504216120212), we get a palindrome (716237732617).

The spelling of 212021612405 in words is "two hundred twelve billion, twenty-one million, six hundred twelve thousand, four hundred five".