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21051566059 = 192938206109
BaseRepresentation
bin10011100110110001…
…010110011111101011
32000100010020100200211
4103212301112133223
5321103200103214
613400532041551
71343451234106
oct234661263753
960303210624
1021051566059
118a23073187
1240b61632b7
131ca64cac84
141039c1773d
158332360c4
hex4e6c567eb

21051566059 has 8 divisors (see below), whose sum is σ = 22923666000. Its totient is φ = 19255878432.

The previous prime is 21051566057. The next prime is 21051566113. The reversal of 21051566059 is 95066515012.

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

It is not a de Polignac number, because 21051566059 - 21 = 21051566057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21051566051) 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, 19102504 + ... + 19103605.

It is an arithmetic number, because the mean of its divisors is an integer number (2865458250).

Almost surely, 221051566059 is an apocalyptic number.

21051566059 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

21051566059 is a deficient number, since it is larger than the sum of its proper divisors (1872099941).

21051566059 is a wasteful number, since it uses less digits than its factorization.

21051566059 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38206157.

The product of its (nonzero) digits is 81000, while the sum is 40.

The spelling of 21051566059 in words is "twenty-one billion, fifty-one million, five hundred sixty-six thousand, fifty-nine".

Divisors: 1 19 29 551 38206109 725916071 1107977161 21051566059