212022021 has 4 divisors (see below), whose sum is σ = 282696032. Its totient is φ = 141348012.

The previous prime is 212021993. The next prime is 212022023. The reversal of 212022021 is 120220212.

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 not a de Polignac number, because 212022021 - 2¹⁴ = 212005637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212021988 and 212022006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212022023) 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, 35337001 + ... + 35337006.

It is an arithmetic number, because the mean of its divisors is an integer number (70674008).

Almost surely, 2^212022021 is an apocalyptic number.

It is an amenable number.

212022021 is a deficient number, since it is larger than the sum of its proper divisors (70674011).

212022021 is an equidigital number, since it uses as much as digits as its factorization.

212022021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70674010.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 212022021 is about 14560.9759631695. The cubic root of 212022021 is about 596.2938405502.

Adding to 212022021 its reverse (120220212), we get a palindrome (332242233).

It can be divided in two parts, 2 and 12022021, that multiplied together give a palindrome (24044042).

The spelling of 212022021 in words is "two hundred twelve million, twenty-two thousand, twenty-one".