10021100021 has 16 divisors (see below), whose sum is σ = 10418595840. Its totient is φ = 9628425840.

The previous prime is 10021100009. The next prime is 10021100081. The reversal of 10021100021 is 12000112001.

It is a cyclic number.

It is not a de Polignac number, because 10021100021 - 2¹⁴ = 10021083637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10021099981 and 10021100008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10021100081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5253950 + ... + 5255856.

It is an arithmetic number, because the mean of its divisors is an integer number (651162240).

Almost surely, 2^10021100021 is an apocalyptic number.

It is an amenable number.

10021100021 is a deficient number, since it is larger than the sum of its proper divisors (397495819).

10021100021 is a wasteful number, since it uses less digits than its factorization.

10021100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3064.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 10021100021 its reverse (12000112001), we get a palindrome (22021212022).

The spelling of 10021100021 in words is "ten billion, twenty-one million, one hundred thousand, twenty-one".