20121221010210 has 16 divisors (see below), whose sum is σ = 48290930424576. Its totient is φ = 5365658936048.

The previous prime is 20121221010193. The next prime is 20121221010211. The reversal of 20121221010210 is 1201012212102.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20121221010210.

It is not an unprimeable number, because it can be changed into a prime (20121221010211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 335353683474 + ... + 335353683533.

It is an arithmetic number, because the mean of its divisors is an integer number (3018183151536).

Almost surely, 2^{20121221010210} is an apocalyptic number.

20121221010210 is an abundant number, since it is smaller than the sum of its proper divisors (28169709414366).

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

20121221010210 is a wasteful number, since it uses less digits than its factorization.

20121221010210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670707367017.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20121221010210 its reverse (1201012212102), we get a palindrome (21322233222312).

The spelling of 20121221010210 in words is "twenty trillion, one hundred twenty-one billion, two hundred twenty-one million, ten thousand, two hundred ten".