100021222021 has 6 divisors (see below), whose sum is σ = 116351217510. Its totient is φ = 85732475976.

The previous prime is 100021221997. The next prime is 100021222031. The reversal of 100021222021 is 120222120001.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 91031337796 + 8989884225 = 301714^2 + 94815^2 .

It is not a de Polignac number, because 100021222021 - 2⁷ = 100021221893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100021221992 and 100021222010.

It is a congruent 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 5 ways as a sum of consecutive naturals, for example, 1020624666 + ... + 1020624763.

It is an arithmetic number, because the mean of its divisors is an integer number (19391869585).

Almost surely, 2^100021222021 is an apocalyptic number.

It is an amenable number.

100021222021 is a deficient number, since it is larger than the sum of its proper divisors (16329995489).

100021222021 is an equidigital number, since it uses as much as digits as its factorization.

100021222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2041249443 (or 2041249436 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 100021222021 its reverse (120222120001), we get a palindrome (220243342022).

The spelling of 100021222021 in words is "one hundred billion, twenty-one million, two hundred twenty-two thousand, twenty-one".