212050921 has 2 divisors, whose sum is σ = 212050922. Its totient is φ = 212050920.

The previous prime is 212050907. The next prime is 212050939. The reversal of 212050921 is 129050212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116402521 + 95648400 = 10789^2 + 9780^2 .

It is a cyclic number.

It is not a de Polignac number, because 212050921 - 2¹³ = 212042729 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212050892 and 212050901.

It is not a weakly prime, because it can be changed into another prime (212050021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106025460 + 106025461.

It is an arithmetic number, because the mean of its divisors is an integer number (106025461).

Almost surely, 2^212050921 is an apocalyptic number.

It is an amenable number.

212050921 is a deficient number, since it is larger than the sum of its proper divisors (1).

212050921 is an equidigital number, since it uses as much as digits as its factorization.

212050921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 212050921 is about 14561.9683078902. The cubic root of 212050921 is about 596.3209322472.

The spelling of 212050921 in words is "two hundred twelve million, fifty thousand, nine hundred twenty-one".