210121612 has 12 divisors (see below), whose sum is σ = 371354256. Its totient is φ = 104020400.

The previous prime is 210121591. The next prime is 210121619. The reversal of 210121612 is 216121012.

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

It is not an unprimeable number, because it can be changed into a prime (210121619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 259648 + ... + 260455.

It is an arithmetic number, because the mean of its divisors is an integer number (30946188).

Almost surely, 2^210121612 is an apocalyptic number.

It is an amenable number.

210121612 is a deficient number, since it is larger than the sum of its proper divisors (161232644).

210121612 is a wasteful number, since it uses less digits than its factorization.

210121612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520208 (or 520206 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 210121612 is about 14495.5721515227. The cubic root of 210121612 is about 594.5069115851.

Adding to 210121612 its reverse (216121012), we get a palindrome (426242624).

The spelling of 210121612 in words is "two hundred ten million, one hundred twenty-one thousand, six hundred twelve".