21020100201 has 6 divisors (see below), whose sum is σ = 30362366970. Its totient is φ = 14013400128.

The previous prime is 21020100163. The next prime is 21020100239. The reversal of 21020100201 is 10200102012.

It is an interprime number because it is at equal distance from previous prime (21020100163) and next prime (21020100239).

It can be written as a sum of positive squares in only one way, i.e., 10915025625 + 10105074576 = 104475^2 + 100524^2 .

It is not a de Polignac number, because 21020100201 - 2⁹ = 21020099689 is a prime.

It is a super-2 number, since 2×21020100201² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 2335566689 = 21020100201 / (2 + 1 + 0 + 2 + 0 + 1 + 0 + 0 + 2 + 0 + 1).

It is not an unprimeable number, because it can be changed into a prime (21020150201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1167783336 + ... + 1167783353.

It is an arithmetic number, because the mean of its divisors is an integer number (5060394495).

Almost surely, 2^21020100201 is an apocalyptic number.

It is an amenable number.

21020100201 is a deficient number, since it is larger than the sum of its proper divisors (9342266769).

21020100201 is a wasteful number, since it uses less digits than its factorization.

21020100201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2335566695 (or 2335566692 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 21020100201 its reverse (10200102012), we get a palindrome (31220202213).

The spelling of 21020100201 in words is "twenty-one billion, twenty million, one hundred thousand, two hundred one".