100121010 has 64 divisors (see below), whose sum is σ = 270618624. Its totient is φ = 23486400.

The previous prime is 100120987. The next prime is 100121011. The reversal of 100121010 is 10121001.

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a self number, because there is not a number n which added to its sum of digits gives 100121010.

It is not an unprimeable number, because it can be changed into a prime (100121011) 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, 5337 + ... + 15123.

It is an arithmetic number, because the mean of its divisors is an integer number (4228416).

Almost surely, 2^100121010 is an apocalyptic number.

100121010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 100121010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135309312).

100121010 is an abundant number, since it is smaller than the sum of its proper divisors (170497614).

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

100121010 is a wasteful number, since it uses less digits than its factorization.

100121010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9839.

The product of its (nonzero) digits is 2, while the sum is 6.

The square root of 100121010 is about 10006.0486706792. The cubic root of 100121010 is about 464.3460341128.

Adding to 100121010 its reverse (10121001), we get a palindrome (110242011).

Subtracting from 100121010 its reverse (10121001), we obtain a palindrome (90000009).

The spelling of 100121010 in words is "one hundred million, one hundred twenty-one thousand, ten".