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21223613 is a prime number
BaseRepresentation
bin101000011110…
…1100010111101
31110221021022202
41100331202331
520413123423
62034521245
7345253265
oct120754275
943837282
1021223613
1110a86684
127136225
134521368
142b667a5
151ce3728
hex143d8bd

21223613 has 2 divisors, whose sum is σ = 21223614. Its totient is φ = 21223612.

The previous prime is 21223603. The next prime is 21223619. The reversal of 21223613 is 31632212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21132409 + 91204 = 4597^2 + 302^2 .

It is a cyclic number.

It is not a de Polignac number, because 21223613 - 28 = 21223357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21223619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611806 + 10611807.

It is an arithmetic number, because the mean of its divisors is an integer number (10611807).

Almost surely, 221223613 is an apocalyptic number.

It is an amenable number.

21223613 is a deficient number, since it is larger than the sum of its proper divisors (1).

21223613 is an equidigital number, since it uses as much as digits as its factorization.

21223613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 20.

The square root of 21223613 is about 4606.9092676110. The cubic root of 21223613 is about 276.8682183216.

Adding to 21223613 its reverse (31632212), we get a palindrome (52855825).

The spelling of 21223613 in words is "twenty-one million, two hundred twenty-three thousand, six hundred thirteen".