100021222220021 has 4 divisors (see below), whose sum is σ = 100080301502412. Its totient is φ = 99962142937632.

The previous prime is 100021222219987. The next prime is 100021222220033. The reversal of 100021222220021 is 120022222120001.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 69609637011121 + 30411585208900 = 8343239^2 + 5514670^2 .

It is a cyclic number.

It is not a de Polignac number, because 100021222220021 - 2²² = 100021218025717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100021222220221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29539638656 + ... + 29539642041.

It is an arithmetic number, because the mean of its divisors is an integer number (25020075375603).

Almost surely, 2^{100021222220021} is an apocalyptic number.

It is an amenable number.

100021222220021 is a deficient number, since it is larger than the sum of its proper divisors (59079282391).

100021222220021 is an equidigital number, since it uses as much as digits as its factorization.

100021222220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59079282390.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 100021222220021 its reverse (120022222120001), we get a palindrome (220043444340022).

The spelling of 100021222220021 in words is "one hundred trillion, twenty-one billion, two hundred twenty-two million, two hundred twenty thousand, twenty-one".