212422021 has 16 divisors (see below), whose sum is σ = 263032704. Its totient is φ = 167376384.

The previous prime is 212421977. The next prime is 212422051. The reversal of 212422021 is 120224212.

It is not a de Polignac number, because 212422021 - 2²¹ = 210324869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212421986 and 212422004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212422051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15640 + ... + 25873.

It is an arithmetic number, because the mean of its divisors is an integer number (16439544).

Almost surely, 2^212422021 is an apocalyptic number.

It is an amenable number.

212422021 is a deficient number, since it is larger than the sum of its proper divisors (50610683).

212422021 is a wasteful number, since it uses less digits than its factorization.

212422021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41580.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 212422021 is about 14574.7048340610. The cubic root of 212422021 is about 596.6685936013.

Adding to 212422021 its reverse (120224212), we get a palindrome (332646233).

The spelling of 212422021 in words is "two hundred twelve million, four hundred twenty-two thousand, twenty-one".