21210101102220 has 24 divisors (see below), whose sum is σ = 59388283086384. Its totient is φ = 5656026960576.

The previous prime is 21210101102131. The next prime is 21210101102231. The reversal of 21210101102220 is 2220110101212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21210101102220.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176750842459 + ... + 176750842578.

It is an arithmetic number, because the mean of its divisors is an integer number (2474511795266).

Almost surely, 2^{21210101102220} is an apocalyptic number.

21210101102220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210101102220 is an abundant number, since it is smaller than the sum of its proper divisors (38178181984164).

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

21210101102220 is a wasteful number, since it uses less digits than its factorization.

21210101102220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353501685049 (or 353501685047 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21210101102220 its reverse (2220110101212), we get a palindrome (23430211203432).

The spelling of 21210101102220 in words is "twenty-one trillion, two hundred ten billion, one hundred one million, one hundred two thousand, two hundred twenty".