21020000101 has 4 divisors (see below), whose sum is σ = 21022922304. Its totient is φ = 21017077900.

The previous prime is 21020000087. The next prime is 21020000119. The reversal of 21020000101 is 10100002012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21020000101 - 2¹⁷ = 21019869029 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 (21020000161) 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, 1450285 + ... + 1464706.

It is an arithmetic number, because the mean of its divisors is an integer number (5255730576).

Almost surely, 2^21020000101 is an apocalyptic number.

It is an amenable number.

21020000101 is a deficient number, since it is larger than the sum of its proper divisors (2922203).

21020000101 is an equidigital number, since it uses as much as digits as its factorization.

21020000101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2922202.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 21020000101 its reverse (10100002012), we get a palindrome (31120002113).

The spelling of 21020000101 in words is "twenty-one billion, twenty million, one hundred one", and thus it is an aban number.