210121223110220 has 96 divisors (see below), whose sum is σ = 467468264757312. Its totient is φ = 79060866121728.

The previous prime is 210121223110093. The next prime is 210121223110223. The reversal of 210121223110220 is 22011322121012.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 210121223110192 and 210121223110201.

It is not an unprimeable number, because it can be changed into a prime (210121223110223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6131865527 + ... + 6131899793.

It is an arithmetic number, because the mean of its divisors is an integer number (4869461091222).

Almost surely, 2^{210121223110220} is an apocalyptic number.

210121223110220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210121223110220 is an abundant number, since it is smaller than the sum of its proper divisors (257347041647092).

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

210121223110220 is a wasteful number, since it uses less digits than its factorization.

210121223110220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43707 (or 43705 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 210121223110220 its reverse (22011322121012), we get a palindrome (232132545231232).

The spelling of 210121223110220 in words is "two hundred ten trillion, one hundred twenty-one billion, two hundred twenty-three million, one hundred ten thousand, two hundred twenty".