210023421 has 8 divisors (see below), whose sum is σ = 284777760. Its totient is φ = 137642352.

The previous prime is 210023417. The next prime is 210023431. The reversal of 210023421 is 124320012.

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

It is not a de Polignac number, because 210023421 - 2² = 210023417 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 210023421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210023431) 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, 593110 + ... + 593463.

It is an arithmetic number, because the mean of its divisors is an integer number (35597220).

Almost surely, 2^210023421 is an apocalyptic number.

It is an amenable number.

210023421 is a deficient number, since it is larger than the sum of its proper divisors (74754339).

210023421 is a wasteful number, since it uses less digits than its factorization.

210023421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1186635.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 210023421 is about 14492.1848249324. The cubic root of 210023421 is about 594.4142916923.

Adding to 210023421 its reverse (124320012), we get a palindrome (334343433).

The spelling of 210023421 in words is "two hundred ten million, twenty-three thousand, four hundred twenty-one".