212067011621 has 4 divisors (see below), whose sum is σ = 212105069772. Its totient is φ = 212028953472.

The previous prime is 212067011609. The next prime is 212067011623. The reversal of 212067011621 is 126110760212.

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 83455120996 + 128611890625 = 288886^2 + 358625^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212067011621 is a prime.

It is a super-2 number, since 2×212067011621² (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 (212067011623) 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, 19020716 + ... + 19031861.

It is an arithmetic number, because the mean of its divisors is an integer number (53026267443).

Almost surely, 2^212067011621 is an apocalyptic number.

It is an amenable number.

212067011621 is a deficient number, since it is larger than the sum of its proper divisors (38058151).

212067011621 is an equidigital number, since it uses as much as digits as its factorization.

212067011621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38058150.

The product of its (nonzero) digits is 2016, while the sum is 29.

Adding to 212067011621 its reverse (126110760212), we get a palindrome (338177771833).

The spelling of 212067011621 in words is "two hundred twelve billion, sixty-seven million, eleven thousand, six hundred twenty-one".