100121221010 has 8 divisors (see below), whose sum is σ = 180218197836. Its totient is φ = 40048488400.

The previous prime is 100121221009. The next prime is 100121221019. The reversal of 100121221010 is 10122121001.

It can be written as a sum of positive squares in 2 ways, for example, as 93037810441 + 7083410569 = 305021^2 + 84163^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 100121220982 and 100121221000.

It is not an unprimeable number, because it can be changed into a prime (100121221019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5006061041 + ... + 5006061060.

Almost surely, 2^100121221010 is an apocalyptic number.

100121221010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

100121221010 is a deficient number, since it is larger than the sum of its proper divisors (80096976826).

100121221010 is a wasteful number, since it uses less digits than its factorization.

100121221010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10012122108.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 100121221010 its reverse (10122121001), we get a palindrome (110243342011).

The spelling of 100121221010 in words is "one hundred billion, one hundred twenty-one million, two hundred twenty-one thousand, ten".