21021200101 has 16 divisors (see below), whose sum is σ = 24170607360. Its totient is φ = 18103059520.

The previous prime is 21021200089. The next prime is 21021200141. The reversal of 21021200101 is 10100212012.

It is a cyclic number.

It is not a de Polignac number, because 21021200101 - 2⁷ = 21021199973 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 (21021200141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 604765 + ... + 638578.

It is an arithmetic number, because the mean of its divisors is an integer number (1510662960).

Almost surely, 2^21021200101 is an apocalyptic number.

It is an amenable number.

21021200101 is a deficient number, since it is larger than the sum of its proper divisors (3149407259).

21021200101 is a wasteful number, since it uses less digits than its factorization.

21021200101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1243436.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21021200101 its reverse (10100212012), we get a palindrome (31121412113).

It can be divided in two parts, 21021 and 200101, that added together give a palindrome (221122).

The spelling of 21021200101 in words is "twenty-one billion, twenty-one million, two hundred thousand, one hundred one".