100001224121420 has 96 divisors (see below), whose sum is σ = 223344117097920. Its totient is φ = 37502873026560.

The previous prime is 100001224121419. The next prime is 100001224121441. The reversal of 100001224121420 is 24121422100001.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 100001224121392 and 100001224121401.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1118324552 + ... + 1118413968.

It is an arithmetic number, because the mean of its divisors is an integer number (2326501219770).

Almost surely, 2^{100001224121420} is an apocalyptic number.

100001224121420 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 100001224121420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111672058548960).

100001224121420 is an abundant number, since it is smaller than the sum of its proper divisors (123342892976500).

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

100001224121420 is a wasteful number, since it uses less digits than its factorization.

100001224121420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119883 (or 119881 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 100001224121420 its reverse (24121422100001), we get a palindrome (124122646221421).

The spelling of 100001224121420 in words is "one hundred trillion, one billion, two hundred twenty-four million, one hundred twenty-one thousand, four hundred twenty".