20101210212220 has 48 divisors (see below), whose sum is σ = 42662425151808. Its totient is φ = 7954849105920.

The previous prime is 20101210212133. The next prime is 20101210212331. The reversal of 20101210212220 is 2221201210102.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20101210212194 and 20101210212203.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3847210 + ... + 7416430.

It is an arithmetic number, because the mean of its divisors is an integer number (888800523996).

Almost surely, 2^{20101210212220} is an apocalyptic number.

20101210212220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20101210212220 is an abundant number, since it is smaller than the sum of its proper divisors (22561214939588).

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

20101210212220 is a wasteful number, since it uses less digits than its factorization.

20101210212220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3572230 (or 3572228 counting only the distinct ones).

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

Adding to 20101210212220 its reverse (2221201210102), we get a palindrome (22322411422322).

The spelling of 20101210212220 in words is "twenty trillion, one hundred one billion, two hundred ten million, two hundred twelve thousand, two hundred twenty".