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21717172019 = 1711311305139
BaseRepresentation
bin10100001110011100…
…011011111100110011
32002001111200122102102
4110032130123330303
5323434044001034
613550550211015
71366112626214
oct241634337463
962044618372
1021717172019
119234860854
124261053a6b
13208138735a
1410a039b40b
158718b297e
hex50e71bf33

21717172019 has 8 divisors (see below), whose sum is σ = 23198147280. Its totient is φ = 20258807296.

The previous prime is 21717172003. The next prime is 21717172021. The reversal of 21717172019 is 91027171712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21717172019 - 24 = 21717172003 is a prime.

It is a super-2 number, since 2×217171720192 (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21717172049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5650649 + ... + 5654490.

It is an arithmetic number, because the mean of its divisors is an integer number (2899768410).

Almost surely, 221717172019 is an apocalyptic number.

21717172019 is a deficient number, since it is larger than the sum of its proper divisors (1480975261).

21717172019 is a wasteful number, since it uses less digits than its factorization.

21717172019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11305269.

The product of its (nonzero) digits is 12348, while the sum is 38.

The spelling of 21717172019 in words is "twenty-one billion, seven hundred seventeen million, one hundred seventy-two thousand, nineteen".

Divisors: 1 17 113 1921 11305139 192187363 1277480707 21717172019