212512021 has 8 divisors (see below), whose sum is σ = 214953984. Its totient is φ = 210082320.

The previous prime is 212511997. The next prime is 212512031. The reversal of 212512021 is 120215212.

It is a happy number.

212512021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 212512021 - 2¹³ = 212503829 is a prime.

It is a super-2 number, since 2×212512021² = 90322718139008882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212511986 and 212512004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212512031) 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, 34356 + ... + 40066.

It is an arithmetic number, because the mean of its divisors is an integer number (26869248).

Almost surely, 2^212512021 is an apocalyptic number.

It is an amenable number.

212512021 is a deficient number, since it is larger than the sum of its proper divisors (2441963).

212512021 is a wasteful number, since it uses less digits than its factorization.

212512021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6131.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 212512021 is about 14577.7920481807. The cubic root of 212512021 is about 596.7528481918.

Adding to 212512021 its reverse (120215212), we get a palindrome (332727233).

The spelling of 212512021 in words is "two hundred twelve million, five hundred twelve thousand, twenty-one".