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12020020211987 = 91571312659191
BaseRepresentation
bin1010111011101010000100…
…0010001111000100010011
31120120002202212122020200022
42232322201002033010103
53033414000133240422
641321530540414055
72350263210010334
oct256724102170423
946502685566608
1012020020211987
113914731059447
12142168854732b
13692638323278
142d7ab484628b
1515ca05830342
hexaeea108f113

12020020211987 has 4 divisors (see below), whose sum is σ = 12021332880336. Its totient is φ = 12018707543640.

The previous prime is 12020020211957. The next prime is 12020020211999. The reversal of 12020020211987 is 78911202002021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12020020211987 - 216 = 12020020146451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12020020211957) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 656320439 + ... + 656338752.

It is an arithmetic number, because the mean of its divisors is an integer number (3005333220084).

Almost surely, 212020020211987 is an apocalyptic number.

12020020211987 is a deficient number, since it is larger than the sum of its proper divisors (1312668349).

12020020211987 is an equidigital number, since it uses as much as digits as its factorization.

12020020211987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1312668348.

The product of its (nonzero) digits is 8064, while the sum is 35.

The spelling of 12020020211987 in words is "twelve trillion, twenty billion, twenty million, two hundred eleven thousand, nine hundred eighty-seven".

Divisors: 1 9157 1312659191 12020020211987