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21124545424 = 247283181283
BaseRepresentation
bin10011101011000111…
…101111101110010000
32000112012120002120021
4103223013233232100
5321230340423144
613412100153224
71345325446663
oct235307575620
960465502507
1021124545424
118a60289704
124116698814
131cb8670928
1410457b36da
1583984e884
hex4eb1efb90

21124545424 has 20 divisors (see below), whose sum is σ = 40934652336. Its totient is φ = 10560764192.

The previous prime is 21124545391. The next prime is 21124545461. The reversal of 21124545424 is 42454542112.

It is a self number, because there is not a number n which added to its sum of digits gives 21124545424.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25887 + ... + 207169.

Almost surely, 221124545424 is an apocalyptic number.

It is an amenable number.

21124545424 is a deficient number, since it is larger than the sum of its proper divisors (19810106912).

21124545424 is a wasteful number, since it uses less digits than its factorization.

21124545424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188574 (or 188568 counting only the distinct ones).

The product of its digits is 51200, while the sum is 34.

The spelling of 21124545424 in words is "twenty-one billion, one hundred twenty-four million, five hundred forty-five thousand, four hundred twenty-four".

Divisors: 1 2 4 8 16 7283 14566 29132 58264 116528 181283 362566 725132 1450264 2900528 1320284089 2640568178 5281136356 10562272712 21124545424