212005421 has 8 divisors (see below), whose sum is σ = 222635904. Its totient is φ = 201492720.

The previous prime is 212005411. The next prime is 212005429. The reversal of 212005421 is 124500212.

212005421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 212005421 - 2²² = 207811117 is a prime.

It is a super-3 number, since 3×212005421³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212005421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212005429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25745 + ... + 32966.

It is an arithmetic number, because the mean of its divisors is an integer number (27829488).

Almost surely, 2^212005421 is an apocalyptic number.

It is an amenable number.

212005421 is a deficient number, since it is larger than the sum of its proper divisors (10630483).

212005421 is a wasteful number, since it uses less digits than its factorization.

212005421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58891.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 212005421 is about 14560.4059352753. The cubic root of 212005421 is about 596.2782781163.

Adding to 212005421 its reverse (124500212), we get a palindrome (336505633).

The spelling of 212005421 in words is "two hundred twelve million, five thousand, four hundred twenty-one".