20212221210100 has 36 divisors (see below), whose sum is σ = 43864408407904. Its totient is φ = 8084171731680.

The previous prime is 20212221210091. The next prime is 20212221210101. The reversal of 20212221210100 is 101212221202.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212221210101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7825062 + ... + 10082461.

Almost surely, 2^{20212221210100} is an apocalyptic number.

20212221210100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20212221210100 is an abundant number, since it is smaller than the sum of its proper divisors (23652187197804).

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

20212221210100 is a wasteful number, since it uses less digits than its factorization.

20212221210100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17918824 (or 17918817 counting only the distinct ones).

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

Adding to 20212221210100 its reverse (101212221202), we get a palindrome (20313433431302).

The spelling of 20212221210100 in words is "twenty trillion, two hundred twelve billion, two hundred twenty-one million, two hundred ten thousand, one hundred".