212021147 has 12 divisors (see below), whose sum is σ = 233926704. Its totient is φ = 192011040.

The previous prime is 212021143. The next prime is 212021203. The reversal of 212021147 is 741120212.

It is not a de Polignac number, because 212021147 - 2² = 212021143 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212021141) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2879 + ... + 20792.

It is an arithmetic number, because the mean of its divisors is an integer number (19493892).

Almost surely, 2^212021147 is an apocalyptic number.

212021147 is a deficient number, since it is larger than the sum of its proper divisors (21905557).

212021147 is a wasteful number, since it uses less digits than its factorization.

212021147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23750 (or 23737 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 212021147 is about 14560.9459514140. The cubic root of 212021147 is about 596.2930211989.

Adding to 212021147 its reverse (741120212), we get a palindrome (953141359).

The spelling of 212021147 in words is "two hundred twelve million, twenty-one thousand, one hundred forty-seven".