21428417201 has 2 divisors, whose sum is σ = 21428417202. Its totient is φ = 21428417200.

The previous prime is 21428417141. The next prime is 21428417233. The reversal of 21428417201 is 10271482412.

It is an a-pointer prime, because the next prime (21428417233) can be obtained adding 21428417201 to its sum of digits (32).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20057640625 + 1370776576 = 141625^2 + 37024^2 .

It is a cyclic number.

It is not a de Polignac number, because 21428417201 - 2²⁶ = 21361308337 is a prime.

It is a super-2 number, since 2×21428417201² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21428417251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10714208600 + 10714208601.

It is an arithmetic number, because the mean of its divisors is an integer number (10714208601).

Almost surely, 2^21428417201 is an apocalyptic number.

It is an amenable number.

21428417201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21428417201 is an equidigital number, since it uses as much as digits as its factorization.

21428417201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7168, while the sum is 32.

Adding to 21428417201 its reverse (10271482412), we get a palindrome (31699899613).

The spelling of 21428417201 in words is "twenty-one billion, four hundred twenty-eight million, four hundred seventeen thousand, two hundred one".