21010601310209 has 24 divisors (see below), whose sum is σ = 24507072361440. Its totient is φ = 17960337432576.

The previous prime is 21010601310199. The next prime is 21010601310217. The reversal of 21010601310209 is 90201310601012.

It is not a de Polignac number, because 21010601310209 - 2¹⁶ = 21010601244673 is a prime.

It is a super-2 number, since 2×21010601310209² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010601310299) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 361306874 + ... + 361365020.

It is an arithmetic number, because the mean of its divisors is an integer number (1021128015060).

Almost surely, 2^{21010601310209} is an apocalyptic number.

It is an amenable number.

21010601310209 is a deficient number, since it is larger than the sum of its proper divisors (3496471051231).

21010601310209 is a wasteful number, since it uses less digits than its factorization.

21010601310209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77997 (or 77990 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 26.

The spelling of 21010601310209 in words is "twenty-one trillion, ten billion, six hundred one million, three hundred ten thousand, two hundred nine".