21616436405101 has 8 divisors (see below), whose sum is σ = 22900700010744. Its totient is φ = 20333584857600.

The previous prime is 21616436405051. The next prime is 21616436405219. The reversal of 21616436405101 is 10150463461612.

It can be written as a sum of positive squares in 4 ways, for example, as 7683573749476 + 13932862655625 = 2771926^2 + 3732675^2 .

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 21616436405101 - 2¹¹ = 21616436403053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21616436400101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 352983010 + ... + 353044243.

It is an arithmetic number, because the mean of its divisors is an integer number (2862587501343).

Almost surely, 2^{21616436405101} is an apocalyptic number.

It is an amenable number.

21616436405101 is a deficient number, since it is larger than the sum of its proper divisors (1284263605643).

21616436405101 is a wasteful number, since it uses less digits than its factorization.

21616436405101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706029071.

The product of its (nonzero) digits is 103680, while the sum is 40.

Adding to 21616436405101 its reverse (10150463461612), we get a palindrome (31766899866713).

The spelling of 21616436405101 in words is "twenty-one trillion, six hundred sixteen billion, four hundred thirty-six million, four hundred five thousand, one hundred one".