21436101101 has 4 divisors (see below), whose sum is σ = 21657091932. Its totient is φ = 21215110272.

The previous prime is 21436101041. The next prime is 21436101109. The reversal of 21436101101 is 10110163412.

It is a happy number.

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 15221143876 + 6214957225 = 123374^2 + 78835^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21436101101 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 (21436101109) 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, 110495270 + ... + 110495463.

It is an arithmetic number, because the mean of its divisors is an integer number (5414272983).

Almost surely, 2^21436101101 is an apocalyptic number.

It is an amenable number.

21436101101 is a deficient number, since it is larger than the sum of its proper divisors (220990831).

21436101101 is an equidigital number, since it uses as much as digits as its factorization.

21436101101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220990830.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 21436101101 its reverse (10110163412), we get a palindrome (31546264513).

The spelling of 21436101101 in words is "twenty-one billion, four hundred thirty-six million, one hundred one thousand, one hundred one".