210421607 has 16 divisors (see below), whose sum is σ = 237416832. Its totient is φ = 184847520.

The previous prime is 210421591. The next prime is 210421613. The reversal of 210421607 is 706124012.

It is not a de Polignac number, because 210421607 - 2⁴ = 210421591 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 (210021607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36368 + ... + 41754.

It is an arithmetic number, because the mean of its divisors is an integer number (14838552).

Almost surely, 2^210421607 is an apocalyptic number.

210421607 is a deficient number, since it is larger than the sum of its proper divisors (26995225).

210421607 is a wasteful number, since it uses less digits than its factorization.

210421607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5518.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 210421607 is about 14505.9162757821. The cubic root of 210421607 is about 594.7897070084.

Adding to 210421607 its reverse (706124012), we get a palindrome (916545619).

The spelling of 210421607 in words is "two hundred ten million, four hundred twenty-one thousand, six hundred seven".