100000012121220 has 192 divisors, whose sum is σ = 289427699957760. Its totient is φ = 25771171161600.

The previous prime is 100000012121173. The next prime is 100000012121279. The reversal of 100000012121220 is 22121210000001.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 100000012121196 and 100000012121205.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5740849671 + ... + 5740867089.

It is an arithmetic number, because the mean of its divisors is an integer number (1507435937280).

Almost surely, 2^{100000012121220} is an apocalyptic number.

100000012121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 100000012121220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144713849978880).

100000012121220 is an abundant number, since it is smaller than the sum of its proper divisors (189427687836540).

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

100000012121220 is a wasteful number, since it uses less digits than its factorization.

100000012121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21506 (or 21504 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 100000012121220 its reverse (22121210000001), we get a palindrome (122121222121221).

The spelling of 100000012121220 in words is "one hundred trillion, twelve million, one hundred twenty-one thousand, two hundred twenty".