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21709491090 = 2357299934471
BaseRepresentation
bin10100001101111111…
…001000101110010010
32002000222020102011120
4110031333020232102
5323430112203330
613550113423110
71365660425640
oct241577105622
962028212146
1021709491090
119230494a81
12425a56aa96
13207c8c8221
14109d35c190
15870d96c10
hex50dfc8b92

21709491090 has 64 divisors (see below), whose sum is σ = 59567616000. Its totient is φ = 4960370880.

The previous prime is 21709491077. The next prime is 21709491127. The reversal of 21709491090 is 9019490712.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 612555 + ... + 647025.

It is an arithmetic number, because the mean of its divisors is an integer number (930744000).

Almost surely, 221709491090 is an apocalyptic number.

21709491090 is an abundant number, since it is smaller than the sum of its proper divisors (37858124910).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21709491090 is a wasteful number, since it uses less digits than its factorization.

21709491090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37487.

The product of its (nonzero) digits is 40824, while the sum is 42.

The spelling of 21709491090 in words is "twenty-one billion, seven hundred nine million, four hundred ninety-one thousand, ninety".

Divisors: 1 2 3 5 6 7 10 14 15 21 30 35 42 70 105 210 2999 5998 8997 14995 17994 20993 29990 34471 41986 44985 62979 68942 89970 103413 104965 125958 172355 206826 209930 241297 314895 344710 482594 517065 629790 723891 1034130 1206485 1447782 2412970 3619455 7238910 103378529 206757058 310135587 516892645 620271174 723649703 1033785290 1447299406 1550677935 2170949109 3101355870 3618248515 4341898218 7236497030 10854745545 21709491090