212021000221 has 4 divisors (see below), whose sum is σ = 212037910912. Its totient is φ = 212004089532.

The previous prime is 212021000207. The next prime is 212021000249. The reversal of 212021000221 is 122000120212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212021000221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021000201) 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, 8436525 + ... + 8461618.

It is an arithmetic number, because the mean of its divisors is an integer number (53009477728).

Almost surely, 2^212021000221 is an apocalyptic number.

It is an amenable number.

212021000221 is a deficient number, since it is larger than the sum of its proper divisors (16910691).

212021000221 is a wasteful number, since it uses less digits than its factorization.

212021000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16910690.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 212021000221 its reverse (122000120212), we get a palindrome (334021120433).

The spelling of 212021000221 in words is "two hundred twelve billion, twenty-one million, two hundred twenty-one", and thus it is an aban number.