212260021 has 2 divisors, whose sum is σ = 212260022. Its totient is φ = 212260020.

The previous prime is 212259989. The next prime is 212260051. The reversal of 212260021 is 120062212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171479025 + 40780996 = 13095^2 + 6386^2 .

It is a cyclic number.

It is not a de Polignac number, because 212260021 - 2⁵ = 212259989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212259977 and 212260004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212260051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106130010 + 106130011.

It is an arithmetic number, because the mean of its divisors is an integer number (106130011).

Almost surely, 2^212260021 is an apocalyptic number.

It is an amenable number.

212260021 is a deficient number, since it is larger than the sum of its proper divisors (1).

212260021 is an equidigital number, since it uses as much as digits as its factorization.

212260021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 212260021 is about 14569.1462001038. The cubic root of 212260021 is about 596.5168753468.

The spelling of 212260021 in words is "two hundred twelve million, two hundred sixty thousand, twenty-one".