210121064 has 16 divisors (see below), whose sum is σ = 403586820. Its totient is φ = 102497920.

The previous prime is 210121063. The next prime is 210121103. The reversal of 210121064 is 460121012.

It can be written as a sum of positive squares in 2 ways, for example, as 200448964 + 9672100 = 14158^2 + 3110^2 .

It is not an unprimeable number, because it can be changed into a prime (210121063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 319979 + ... + 320634.

Almost surely, 2^210121064 is an apocalyptic number.

It is an amenable number.

210121064 is a deficient number, since it is larger than the sum of its proper divisors (193465756).

210121064 is a wasteful number, since it uses less digits than its factorization.

210121064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640660 (or 640656 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 210121064 is about 14495.5532491865. The cubic root of 210121064 is about 594.5063947574.

Adding to 210121064 its reverse (460121012), we get a palindrome (670242076).

The spelling of 210121064 in words is "two hundred ten million, one hundred twenty-one thousand, sixty-four".