100021222001 has 4 divisors (see below), whose sum is σ = 100022141604. Its totient is φ = 100020302400.

The previous prime is 100021221997. The next prime is 100021222031. The reversal of 100021222001 is 100222120001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 100222120001 = 21961 ⋅4563641.

It can be written as a sum of positive squares in 2 ways, for example, as 89090310400 + 10930911601 = 298480^2 + 104551^2 .

It is a cyclic number.

It is not a de Polignac number, because 100021222001 - 2² = 100021221997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100021222031) 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, 270740 + ... + 522821.

It is an arithmetic number, because the mean of its divisors is an integer number (25005535401).

Almost surely, 2^100021222001 is an apocalyptic number.

It is an amenable number.

100021222001 is a deficient number, since it is larger than the sum of its proper divisors (919603).

100021222001 is an equidigital number, since it uses as much as digits as its factorization.

100021222001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 919602.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 100021222001 its reverse (100222120001), we get a palindrome (200243342002).

The spelling of 100021222001 in words is "one hundred billion, twenty-one million, two hundred twenty-two thousand, one".