21200120101 has 8 divisors (see below), whose sum is σ = 21531757184. Its totient is φ = 20868930720.

The previous prime is 21200120087. The next prime is 21200120159. The reversal of 21200120101 is 10102100212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21200120101 - 2²⁷ = 21065902373 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 (21200120171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15840 + ... + 206521.

It is an arithmetic number, because the mean of its divisors is an integer number (2691469648).

Almost surely, 2^21200120101 is an apocalyptic number.

It is an amenable number.

21200120101 is a deficient number, since it is larger than the sum of its proper divisors (331637083).

21200120101 is a wasteful number, since it uses less digits than its factorization.

21200120101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223851.

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

Adding to 21200120101 its reverse (10102100212), we get a palindrome (31302220313).

The spelling of 21200120101 in words is "twenty-one billion, two hundred million, one hundred twenty thousand, one hundred one".