210121121210 has 64 divisors (see below), whose sum is σ = 507817223424. Its totient is φ = 60454425600.

The previous prime is 210121121207. The next prime is 210121121263. The reversal of 210121121210 is 12121121012.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10485551 + ... + 10505570.

It is an arithmetic number, because the mean of its divisors is an integer number (7934644116).

Almost surely, 2^210121121210 is an apocalyptic number.

210121121210 is an abundant number, since it is smaller than the sum of its proper divisors (297696102214).

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

210121121210 is a wasteful number, since it uses less digits than its factorization.

210121121210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20991159.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 210121121210 its reverse (12121121012), we get a palindrome (222242242222).

The spelling of 210121121210 in words is "two hundred ten billion, one hundred twenty-one million, one hundred twenty-one thousand, two hundred ten".