212040133421 has 4 divisors (see below), whose sum is σ = 215516201244. Its totient is φ = 208564065600.

The previous prime is 212040133381. The next prime is 212040133427. The reversal of 212040133421 is 124331040212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 67042155625 + 144997977796 = 258925^2 + 380786^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212040133421 is a prime.

It is a super-2 number, since 2×212040133421² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212040133427) 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, 1738033820 + ... + 1738033941.

It is an arithmetic number, because the mean of its divisors is an integer number (53879050311).

Almost surely, 2^212040133421 is an apocalyptic number.

It is an amenable number.

212040133421 is a deficient number, since it is larger than the sum of its proper divisors (3476067823).

212040133421 is an equidigital number, since it uses as much as digits as its factorization.

212040133421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3476067822.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 212040133421 its reverse (124331040212), we get a palindrome (336371173633).

The spelling of 212040133421 in words is "two hundred twelve billion, forty million, one hundred thirty-three thousand, four hundred twenty-one".