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21911399 is a prime number
BaseRepresentation
bin101001110010…
…1011101100111
31112020012210022
41103211131213
521102131044
62101345355
7354146426
oct123453547
945205708
1021911399
11114063a4
12740825b
134702433
142ca52bd
151dcc3ee
hex14e5767

21911399 has 2 divisors, whose sum is σ = 21911400. Its totient is φ = 21911398.

The previous prime is 21911377. The next prime is 21911411. The reversal of 21911399 is 99311912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21911399 - 28 = 21911143 is a prime.

It is a super-2 number, since 2×219113992 = 960218812274402, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21911339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10955699 + 10955700.

It is an arithmetic number, because the mean of its divisors is an integer number (10955700).

Almost surely, 221911399 is an apocalyptic number.

21911399 is a deficient number, since it is larger than the sum of its proper divisors (1).

21911399 is an equidigital number, since it uses as much as digits as its factorization.

21911399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4374, while the sum is 35.

The square root of 21911399 is about 4680.9613328888. The cubic root of 21911399 is about 279.8272701669.

The spelling of 21911399 in words is "twenty-one million, nine hundred eleven thousand, three hundred ninety-nine".