212821147 has 64 divisors (see below), whose sum is σ = 304128000. Its totient is φ = 143700480.

The previous prime is 212821121. The next prime is 212821153. The reversal of 212821147 is 741128212.

It is not a de Polignac number, because 212821147 - 2¹⁹ = 212296859 is a prime.

It is a super-2 number, since 2×212821147² = 90585681220791218, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212821117) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1069354 + ... + 1069552.

It is an arithmetic number, because the mean of its divisors is an integer number (4752000).

Almost surely, 2^212821147 is an apocalyptic number.

212821147 is a deficient number, since it is larger than the sum of its proper divisors (91306853).

212821147 is a wasteful number, since it uses less digits than its factorization.

212821147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296.

The product of its digits is 1792, while the sum is 28.

The square root of 212821147 is about 14588.3908296974. The cubic root of 212821147 is about 597.0420591995.

Adding to 212821147 its reverse (741128212), we get a palindrome (953949359).

The spelling of 212821147 in words is "two hundred twelve million, eight hundred twenty-one thousand, one hundred forty-seven".