212345021 has 8 divisors (see below), whose sum is σ = 243115584. Its totient is φ = 181683360.

The previous prime is 212345017. The next prime is 212345033. The reversal of 212345021 is 120543212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212345021 - 2² = 212345017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 212344984 and 212345002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212345041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23000 + ... + 30881.

It is an arithmetic number, because the mean of its divisors is an integer number (30389448).

Almost surely, 2^212345021 is an apocalyptic number.

It is an amenable number.

212345021 is a deficient number, since it is larger than the sum of its proper divisors (30770563).

212345021 is an equidigital number, since it uses as much as digits as its factorization.

212345021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54451.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 212345021 is about 14572.0630317056. The cubic root of 212345021 is about 596.5964902260.

Adding to 212345021 its reverse (120543212), we get a palindrome (332888233).

The spelling of 212345021 in words is "two hundred twelve million, three hundred forty-five thousand, twenty-one".