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21437568326321 = 767211121652819
BaseRepresentation
bin1001101111111010100101…
…01001010001101010110001
32210220102002222220000102222
410313331102221101222301
510302213114442420241
6113332141040250425
74341545633130050
oct467752251215261
983812088800388
1021437568326321
1169156924979a4
1224a28b2310a15
13bc67282447a4
145418260cc397
1527299129ba4b
hex137f52a51ab1

21437568326321 has 16 divisors (see below), whose sum is σ = 24877531176960. Its totient is φ = 18092228608080.

The previous prime is 21437568326287. The next prime is 21437568326329. The reversal of 21437568326321 is 12362386573412.

It is a cyclic number.

It is not a de Polignac number, because 21437568326321 - 234 = 21420388457137 is a prime.

It is a super-2 number, since 2×214375683263212 (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21437568326329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9836351 + ... + 11816468.

It is an arithmetic number, because the mean of its divisors is an integer number (1554845698560).

Almost surely, 221437568326321 is an apocalyptic number.

It is an amenable number.

21437568326321 is a deficient number, since it is larger than the sum of its proper divisors (3439962850639).

21437568326321 is a wasteful number, since it uses less digits than its factorization.

21437568326321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21655004.

The product of its digits is 8709120, while the sum is 53.

The spelling of 21437568326321 in words is "twenty-one trillion, four hundred thirty-seven billion, five hundred sixty-eight million, three hundred twenty-six thousand, three hundred twenty-one".

Divisors: 1 7 67 469 2111 14777 141437 990059 21652819 151569733 1450738873 10155172111 45709100909 319963706363 3062509760903 21437568326321