21421134101 has 4 divisors (see below), whose sum is σ = 21421457100. Its totient is φ = 21420811104.

The previous prime is 21421134079. The next prime is 21421134103. The reversal of 21421134101 is 10143112412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12859333201 + 8561800900 = 113399^2 + 92530^2 .

It is a cyclic number.

It is not a de Polignac number, because 21421134101 - 2¹⁰ = 21421133077 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 (21421134103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21656 + ... + 208113.

It is an arithmetic number, because the mean of its divisors is an integer number (5355364275).

Almost surely, 2^21421134101 is an apocalyptic number.

It is an amenable number.

21421134101 is a deficient number, since it is larger than the sum of its proper divisors (322999).

21421134101 is an equidigital number, since it uses as much as digits as its factorization.

21421134101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322998.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21421134101 its reverse (10143112412), we get a palindrome (31564246513).

The spelling of 21421134101 in words is "twenty-one billion, four hundred twenty-one million, one hundred thirty-four thousand, one hundred one".