21210200220 has 96 divisors (see below), whose sum is σ = 64811851776. Its totient is φ = 5139936000.

The previous prime is 21210200201. The next prime is 21210200239. The reversal of 21210200220 is 2200201212.

It is an interprime number because it is at equal distance from previous prime (21210200201) and next prime (21210200239).

It is a super-3 number, since 3×21210200220³ (a number of 32 digits) contains 333 as substring.

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 = 21210200196 and 21210200205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2614170 + ... + 2622270.

It is an arithmetic number, because the mean of its divisors is an integer number (675123456).

Almost surely, 2^21210200220 is an apocalyptic number.

21210200220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210200220 is an abundant number, since it is smaller than the sum of its proper divisors (43601651556).

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

21210200220 is a wasteful number, since it uses less digits than its factorization.

21210200220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12091 (or 12089 counting only the distinct ones).

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

Adding to 21210200220 its reverse (2200201212), we get a palindrome (23410401432).

The spelling of 21210200220 in words is "twenty-one billion, two hundred ten million, two hundred thousand, two hundred twenty".