21212020102210 has 32 divisors (see below), whose sum is σ = 44250749390592. Its totient is φ = 7170260314560.

The previous prime is 21212020102181. The next prime is 21212020102219. The reversal of 21212020102210 is 1220102021212.

It is a happy number.

It is a super-2 number, since 2×21212020102210² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21212020102219) 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, 2134001077 + ... + 2134011016.

It is an arithmetic number, because the mean of its divisors is an integer number (1382835918456).

Almost surely, 2^{21212020102210} is an apocalyptic number.

21212020102210 is an abundant number, since it is smaller than the sum of its proper divisors (23038729288382).

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

21212020102210 is a wasteful number, since it uses less digits than its factorization.

21212020102210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4268012178.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21212020102210 its reverse (1220102021212), we get a palindrome (22432122123422).

The spelling of 21212020102210 in words is "twenty-one trillion, two hundred twelve billion, twenty million, one hundred two thousand, two hundred ten".