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21389719451 is a prime number
BaseRepresentation
bin10011111010111011…
…010011011110011011
32001012200112022221112
4103322323103132123
5322301232010301
613454251530535
71355025421052
oct237273233633
961180468845
1021389719451
119086a368a1
12418b459a4b
13202b596c39
14106cabd399
15852c7e9bb
hex4faed379b

21389719451 has 2 divisors, whose sum is σ = 21389719452. Its totient is φ = 21389719450.

The previous prime is 21389719409. The next prime is 21389719493. The reversal of 21389719451 is 15491798312.

It is a balanced prime because it is at equal distance from previous prime (21389719409) and next prime (21389719493).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-21389719451 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21389719451.

It is not a weakly prime, because it can be changed into another prime (21389719151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10694859725 + 10694859726.

It is an arithmetic number, because the mean of its divisors is an integer number (10694859726).

Almost surely, 221389719451 is an apocalyptic number.

21389719451 is a deficient number, since it is larger than the sum of its proper divisors (1).

21389719451 is an equidigital number, since it uses as much as digits as its factorization.

21389719451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 50.

The spelling of 21389719451 in words is "twenty-one billion, three hundred eighty-nine million, seven hundred nineteen thousand, four hundred fifty-one".