100121211000 has 512 divisors, whose sum is σ = 369173376000. Its totient is φ = 25014528000.

The previous prime is 100121210989. The next prime is 100121211007. The reversal of 100121211000 is 112121001.

100121211000 = T₄₉₆₈₀ + T₄₉₆₈₁ + ... + T₄₉₇₆₀.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100121211007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 151928671 + ... + 151929329.

It is an arithmetic number, because the mean of its divisors is an integer number (721041750).

Almost surely, 2^100121211000 is an apocalyptic number.

100121211000 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 100121211000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184586688000).

100121211000 is an abundant number, since it is smaller than the sum of its proper divisors (269052165000).

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

100121211000 is a wasteful number, since it uses less digits than its factorization.

100121211000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1037 (or 1017 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 100121211000 its reverse (112121001), we get a palindrome (100233332001).

The spelling of 100121211000 in words is "one hundred billion, one hundred twenty-one million, two hundred eleven thousand".