210521034 has 96 divisors (see below), whose sum is σ = 492972480. Its totient is φ = 64802304.

The previous prime is 210521033. The next prime is 210521039. The reversal of 210521034 is 430125012.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 210520998 and 210521016.

It is not an unprimeable number, because it can be changed into a prime (210521033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1862962 + ... + 1863074.

It is an arithmetic number, because the mean of its divisors is an integer number (5135130).

Almost surely, 2^210521034 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 210521034, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (246486240).

210521034 is an abundant number, since it is smaller than the sum of its proper divisors (282451446).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

210521034 is a wasteful number, since it uses less digits than its factorization.

210521034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276 (or 273 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 210521034 is about 14509.3429899496. The cubic root of 210521034 is about 594.8833742653.

Adding to 210521034 its reverse (430125012), we get a palindrome (640646046).

The spelling of 210521034 in words is "two hundred ten million, five hundred twenty-one thousand, thirty-four".