21010110201 has 12 divisors (see below), whose sum is σ = 30350026980. Its totient is φ = 14005775520.

The previous prime is 21010110179. The next prime is 21010110239. The reversal of 21010110201 is 10201101012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 14875461225 + 6134648976 = 121965^2 + 78324^2 .

It is not a de Polignac number, because 21010110201 - 2⁶ = 21010110137 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (21010110101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72955 + ... + 217583.

It is an arithmetic number, because the mean of its divisors is an integer number (2529168915).

Almost surely, 2^21010110201 is an apocalyptic number.

It is an amenable number.

21010110201 is a deficient number, since it is larger than the sum of its proper divisors (9339916779).

21010110201 is a wasteful number, since it uses less digits than its factorization.

21010110201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160776 (or 160773 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 21010110201 its reverse (10201101012), we get a palindrome (31211211213).

The spelling of 21010110201 in words is "twenty-one billion, ten million, one hundred ten thousand, two hundred one".