212021229 has 32 divisors (see below), whose sum is σ = 345980160. Its totient is φ = 112730112.

The previous prime is 212021213. The next prime is 212021237. The reversal of 212021229 is 922120212.

It is a happy number.

It is not a de Polignac number, because 212021229 - 2⁴ = 212021213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28437 + ... + 35109.

It is an arithmetic number, because the mean of its divisors is an integer number (10811880).

Almost surely, 2^212021229 is an apocalyptic number.

It is an amenable number.

212021229 is a deficient number, since it is larger than the sum of its proper divisors (133958931).

212021229 is a wasteful number, since it uses less digits than its factorization.

212021229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6789.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 212021229 is about 14560.9487671649. The cubic root of 212021229 is about 596.2930980718.

The spelling of 212021229 in words is "two hundred twelve million, twenty-one thousand, two hundred twenty-nine".