21536307101 has 4 divisors (see below), whose sum is σ = 21942652572. Its totient is φ = 21129961632.

The previous prime is 21536307059. The next prime is 21536307113. The reversal of 21536307101 is 10170363512.

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 7081054201 + 14455252900 = 84149^2 + 120230^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21536307101 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 (21536307181) 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, 203172656 + ... + 203172761.

It is an arithmetic number, because the mean of its divisors is an integer number (5485663143).

Almost surely, 2^21536307101 is an apocalyptic number.

It is an amenable number.

21536307101 is a deficient number, since it is larger than the sum of its proper divisors (406345471).

21536307101 is an equidigital number, since it uses as much as digits as its factorization.

21536307101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406345470.

The product of its (nonzero) digits is 3780, while the sum is 29.

The spelling of 21536307101 in words is "twenty-one billion, five hundred thirty-six million, three hundred seven thousand, one hundred one".