100212102121720 has 16 divisors (see below), whose sum is σ = 225477229773960. Its totient is φ = 40084840848672.

The previous prime is 100212102121687. The next prime is 100212102121721. The reversal of 100212102121720 is 27121201212001.

It is a junction number, because it is equal to n+sod(n) for n = 100212102121691 and 100212102121700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100212102121721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1252651276482 + ... + 1252651276561.

Almost surely, 2^{100212102121720} is an apocalyptic number.

100212102121720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100212102121720 is an abundant number, since it is smaller than the sum of its proper divisors (125265127652240).

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

100212102121720 is a wasteful number, since it uses less digits than its factorization.

100212102121720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2505302553054 (or 2505302553050 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 22.

Adding to 100212102121720 its reverse (27121201212001), we get a palindrome (127333303333721).

The spelling of 100212102121720 in words is "one hundred trillion, two hundred twelve billion, one hundred two million, one hundred twenty-one thousand, seven hundred twenty".