100211221000 has 128 divisors (see below), whose sum is σ = 258161904000. Its totient is φ = 36105696000.

The previous prime is 100211220983. The next prime is 100211221001. The reversal of 100211221000 is 122112001.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (100211221001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1157211 + ... + 1240789.

It is an arithmetic number, because the mean of its divisors is an integer number (2016889875).

Almost surely, 2^100211221000 is an apocalyptic number.

100211221000 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 100211221000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129080952000).

100211221000 is an abundant number, since it is smaller than the sum of its proper divisors (157950683000).

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

100211221000 is a wasteful number, since it uses less digits than its factorization.

100211221000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83720 (or 83706 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 100211221000 its reverse (122112001), we get a palindrome (100333333001).

The spelling of 100211221000 in words is "one hundred billion, two hundred eleven million, two hundred twenty-one thousand".