21211634035601 has 2 divisors, whose sum is σ = 21211634035602. Its totient is φ = 21211634035600.

The previous prime is 21211634035591. The next prime is 21211634035721. The reversal of 21211634035601 is 10653043611212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13014950925376 + 8196683110225 = 3607624^2 + 2862985^2 .

It is a cyclic number.

It is not a de Polignac number, because 21211634035601 - 2⁴² = 16813587524497 is a prime.

It is not a weakly prime, because it can be changed into another prime (21211634035901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605817017800 + 10605817017801.

It is an arithmetic number, because the mean of its divisors is an integer number (10605817017801).

Almost surely, 2^{21211634035601} is an apocalyptic number.

It is an amenable number.

21211634035601 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211634035601 is an equidigital number, since it uses as much as digits as its factorization.

21211634035601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 35.

Adding to 21211634035601 its reverse (10653043611212), we get a palindrome (31864677646813).

The spelling of 21211634035601 in words is "twenty-one trillion, two hundred eleven billion, six hundred thirty-four million, thirty-five thousand, six hundred one".