210020021220 has 48 divisors (see below), whose sum is σ = 601731789120. Its totient is φ = 54702888576.

The previous prime is 210020021153. The next prime is 210020021221. The reversal of 210020021220 is 22120020012.

210020021220 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 210020021196 and 210020021205.

It is not an unprimeable number, because it can be changed into a prime (210020021221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40698975 + ... + 40704134.

It is an arithmetic number, because the mean of its divisors is an integer number (12536078940).

Almost surely, 2^210020021220 is an apocalyptic number.

210020021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210020021220 is an abundant number, since it is smaller than the sum of its proper divisors (391711767900).

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

210020021220 is a wasteful number, since it uses less digits than its factorization.

210020021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81403164 (or 81403162 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 210020021220 its reverse (22120020012), we get a palindrome (232140041232).

The spelling of 210020021220 in words is "two hundred ten billion, twenty million, twenty-one thousand, two hundred twenty".