21210001102220 has 48 divisors (see below), whose sum is σ = 53898355748160. Its totient is φ = 6844235649024.

The previous prime is 21210001102201. The next prime is 21210001102229. The reversal of 21210001102220 is 2220110001212.

It is a super-2 number, since 2×21210001102220² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 21210001102195 and 21210001102204.

It is not an unprimeable number, because it can be changed into a prime (21210001102229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4455880205 + ... + 4455884964.

It is an arithmetic number, because the mean of its divisors is an integer number (1122882411420).

Almost surely, 2^{21210001102220} is an apocalyptic number.

21210001102220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210001102220 is an abundant number, since it is smaller than the sum of its proper divisors (32688354645940).

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

21210001102220 is a wasteful number, since it uses less digits than its factorization.

21210001102220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8911765202 (or 8911765200 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21210001102220 its reverse (2220110001212), we get a palindrome (23430111103432).

The spelling of 21210001102220 in words is "twenty-one trillion, two hundred ten billion, one million, one hundred two thousand, two hundred twenty".