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21124545391 is a prime number
BaseRepresentation
bin10011101011000111…
…101111101101101111
32000112012120002112001
4103223013233231233
5321230340423031
613412100153131
71345325446615
oct235307575557
960465502461
1021124545391
118a60289684
1241166987a7
131cb8670901
1410457b36b5
1583984e861
hex4eb1efb6f

21124545391 has 2 divisors, whose sum is σ = 21124545392. Its totient is φ = 21124545390.

The previous prime is 21124545361. The next prime is 21124545461. The reversal of 21124545391 is 19354542112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21124545391 - 213 = 21124537199 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21124545391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21124545311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10562272695 + 10562272696.

It is an arithmetic number, because the mean of its divisors is an integer number (10562272696).

Almost surely, 221124545391 is an apocalyptic number.

21124545391 is a deficient number, since it is larger than the sum of its proper divisors (1).

21124545391 is an equidigital number, since it uses as much as digits as its factorization.

21124545391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43200, while the sum is 37.

The spelling of 21124545391 in words is "twenty-one billion, one hundred twenty-four million, five hundred forty-five thousand, three hundred ninety-one".