210121202221100 has 72 divisors (see below), whose sum is σ = 457126161428160. Its totient is φ = 83834208069120.

The previous prime is 210121202221093. The next prime is 210121202221109. The reversal of 210121202221100 is 1122202121012.

210121202221100 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (210121202221109) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 125621066 + ... + 127282734.

It is an arithmetic number, because the mean of its divisors is an integer number (6348974464280).

Almost surely, 2^{210121202221100} is an apocalyptic number.

210121202221100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210121202221100 is an abundant number, since it is smaller than the sum of its proper divisors (247004959207060).

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

210121202221100 is a wasteful number, since it uses less digits than its factorization.

210121202221100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1664907 (or 1664900 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 210121202221100 its reverse (1122202121012), we get a palindrome (211243404342112).

The spelling of 210121202221100 in words is "two hundred ten trillion, one hundred twenty-one billion, two hundred two million, two hundred twenty-one thousand, one hundred".