212545021 has 8 divisors (see below), whose sum is σ = 236278784. Its totient is φ = 189866160.

The previous prime is 212545019. The next prime is 212545027. The reversal of 212545021 is 120545212.

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 212545021 - 2¹ = 212545019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212544983 and 212545001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212545027) 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, 263301 + ... + 264106.

It is an arithmetic number, because the mean of its divisors is an integer number (29534848).

Almost surely, 2^212545021 is an apocalyptic number.

It is an amenable number.

212545021 is a deficient number, since it is larger than the sum of its proper divisors (23733763).

212545021 is a wasteful number, since it uses less digits than its factorization.

212545021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527451.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 212545021 is about 14578.9238628919. The cubic root of 212545021 is about 596.7837355814.

The spelling of 212545021 in words is "two hundred twelve million, five hundred forty-five thousand, twenty-one".