212541021 has 48 divisors (see below), whose sum is σ = 405295488. Its totient is φ = 103910400.

The previous prime is 212541013. The next prime is 212541023. The reversal of 212541021 is 120145212.

It is not a de Polignac number, because 212541021 - 2³ = 212541013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212540985 and 212541003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212541023) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2761 + ... + 20801.

It is an arithmetic number, because the mean of its divisors is an integer number (8443656).

Almost surely, 2^212541021 is an apocalyptic number.

212541021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

212541021 is a deficient number, since it is larger than the sum of its proper divisors (192754467).

212541021 is a wasteful number, since it uses less digits than its factorization.

212541021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18082 (or 18079 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 212541021 is about 14578.7866779098. The cubic root of 212541021 is about 596.7799918257.

Adding to 212541021 its reverse (120145212), we get a palindrome (332686233).

The spelling of 212541021 in words is "two hundred twelve million, five hundred forty-one thousand, twenty-one".