210121040 has 40 divisors (see below), whose sum is σ = 494730240. Its totient is φ = 82982016.

The previous prime is 210121001. The next prime is 210121063. The reversal of 210121040 is 40121012.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10304 + ... + 22943.

It is an arithmetic number, because the mean of its divisors is an integer number (12368256).

Almost surely, 2^210121040 is an apocalyptic number.

210121040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210121040 is an abundant number, since it is smaller than the sum of its proper divisors (284609200).

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

210121040 is a wasteful number, since it uses less digits than its factorization.

210121040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33339 (or 33333 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 210121040 is about 14495.5524213463. The cubic root of 210121040 is about 594.5063721225.

Adding to 210121040 its reverse (40121012), we get a palindrome (250242052).

The spelling of 210121040 in words is "two hundred ten million, one hundred twenty-one thousand, forty".