21200421101 has 8 divisors (see below), whose sum is σ = 21235113984. Its totient is φ = 21165751440.

The previous prime is 21200421049. The next prime is 21200421113. The reversal of 21200421101 is 10112400212.

It is a happy number.

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 21200421101 - 2³⁴ = 4020551917 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 (21200421161) 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 7 ways as a sum of consecutive naturals, for example, 2938040 + ... + 2945246.

It is an arithmetic number, because the mean of its divisors is an integer number (2654389248).

Almost surely, 2^21200421101 is an apocalyptic number.

It is an amenable number.

21200421101 is a deficient number, since it is larger than the sum of its proper divisors (34692883).

21200421101 is an equidigital number, since it uses as much as digits as its factorization.

21200421101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11611.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21200421101 its reverse (10112400212), we get a palindrome (31312821313).

The spelling of 21200421101 in words is "twenty-one billion, two hundred million, four hundred twenty-one thousand, one hundred one".