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21321301 is a prime number
BaseRepresentation
bin101000101010…
…1011001010101
31111010020022211
41101111121111
520424240201
62040553421
7346141141
oct121253125
944106284
1021321301
1111043011
127182871
134556971
142b90221
151d12651
hex1455655

21321301 has 2 divisors, whose sum is σ = 21321302. Its totient is φ = 21321300.

The previous prime is 21321283. The next prime is 21321331. The reversal of 21321301 is 10312312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21169201 + 152100 = 4601^2 + 390^2 .

It is a cyclic number.

It is not a de Polignac number, because 21321301 - 219 = 20797013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21321331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660650 + 10660651.

It is an arithmetic number, because the mean of its divisors is an integer number (10660651).

Almost surely, 221321301 is an apocalyptic number.

It is an amenable number.

21321301 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321301 is an equidigital number, since it uses as much as digits as its factorization.

21321301 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 21321301 is about 4617.4994315105. The cubic root of 21321301 is about 277.2923577218.

Adding to 21321301 its reverse (10312312), we get a palindrome (31633613).

The spelling of 21321301 in words is "twenty-one million, three hundred twenty-one thousand, three hundred one".