210979421 has 2 divisors, whose sum is σ = 210979422. Its totient is φ = 210979420.

The previous prime is 210979409. The next prime is 210979423. The reversal of 210979421 is 124979012.

210979421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168220900 + 42758521 = 12970^2 + 6539^2 .

It is a cyclic number.

It is not a de Polignac number, because 210979421 - 2⁶ = 210979357 is a prime.

It is a super-3 number, since 3×210979421³ (a number of 26 digits) contains 333 as substring.

Together with 210979423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210979423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105489710 + 105489711.

It is an arithmetic number, because the mean of its divisors is an integer number (105489711).

Almost surely, 2^210979421 is an apocalyptic number.

It is an amenable number.

210979421 is a deficient number, since it is larger than the sum of its proper divisors (1).

210979421 is an equidigital number, since it uses as much as digits as its factorization.

210979421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 210979421 is about 14525.1306706687. The cubic root of 210979421 is about 595.3148262105.

The spelling of 210979421 in words is "two hundred ten million, nine hundred seventy-nine thousand, four hundred twenty-one".