21404334101 has 4 divisors (see below), whose sum is σ = 21547987500. Its totient is φ = 21260680704.

The previous prime is 21404334071. The next prime is 21404334113. The reversal of 21404334101 is 10143340412.

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 8087404900 + 13316929201 = 89930^2 + 115399^2 .

It is a cyclic number.

It is not a de Polignac number, because 21404334101 - 2²² = 21400139797 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 (21404334131) 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, 71826476 + ... + 71826773.

It is an arithmetic number, because the mean of its divisors is an integer number (5386996875).

Almost surely, 2^21404334101 is an apocalyptic number.

It is an amenable number.

21404334101 is a deficient number, since it is larger than the sum of its proper divisors (143653399).

21404334101 is a wasteful number, since it uses less digits than its factorization.

21404334101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143653398.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21404334101 its reverse (10143340412), we get a palindrome (31547674513).

The spelling of 21404334101 in words is "twenty-one billion, four hundred four million, three hundred thirty-four thousand, one hundred one".