210121010121210 has 32 divisors (see below), whose sum is σ = 504300224039040. Its totient is φ = 56031180504768.

The previous prime is 210121010121199. The next prime is 210121010121223. The reversal of 210121010121210 is 12121010121012.

It is a happy number.

210121010121210 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a Harshad number since it is a multiple of its sum of digits (15).

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

It is a self number, because there is not a number n which added to its sum of digits gives 210121010121210.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66483697 + ... + 69572436.

It is an arithmetic number, because the mean of its divisors is an integer number (15759382001220).

Almost surely, 2^{210121010121210} is an apocalyptic number.

210121010121210 is an abundant number, since it is smaller than the sum of its proper divisors (294179213917830).

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

210121010121210 is a wasteful number, since it uses less digits than its factorization.

210121010121210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136107622.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 210121010121210 its reverse (12121010121012), we get a palindrome (222242020242222).

The spelling of 210121010121210 in words is "two hundred ten trillion, one hundred twenty-one billion, ten million, one hundred twenty-one thousand, two hundred ten".