210704421 has 8 divisors (see below), whose sum is σ = 281025184. Its totient is φ = 140426640.

The previous prime is 210704413. The next prime is 210704437. The reversal of 210704421 is 124407012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 210704421 - 2³ = 210704413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210704491) 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, 3330 + ... + 20796.

It is an arithmetic number, because the mean of its divisors is an integer number (35128148).

Almost surely, 2^210704421 is an apocalyptic number.

It is an amenable number.

210704421 is a deficient number, since it is larger than the sum of its proper divisors (70320763).

210704421 is a wasteful number, since it uses less digits than its factorization.

210704421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21491.

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 210704421 is about 14515.6612319246. The cubic root of 210704421 is about 595.0560604383.

The spelling of 210704421 in words is "two hundred ten million, seven hundred four thousand, four hundred twenty-one".