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BaseRepresentation
bin1001110110011011100111…
…11110000110010100100111
32211200211000210100201020002
410323031303332012110213
510314400140211414031
6114023050122531515
74363663212516632
oct473156376062447
984624023321202
1021661465732391
1169a1637768a71
12251a179066b9b
13c1188a51b914
1454c5c5d40c19
152786e76e8ccb
hex13b373f86527

21661465732391 has 2 divisors, whose sum is σ = 21661465732392. Its totient is φ = 21661465732390.

The previous prime is 21661465732369. The next prime is 21661465732429. The reversal of 21661465732391 is 19323756416612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21661465732391 - 26 = 21661465732327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21661465732331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10830732866195 + 10830732866196.

It is an arithmetic number, because the mean of its divisors is an integer number (10830732866196).

Almost surely, 221661465732391 is an apocalyptic number.

21661465732391 is a deficient number, since it is larger than the sum of its proper divisors (1).

21661465732391 is an equidigital number, since it uses as much as digits as its factorization.

21661465732391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9797760, while the sum is 56.

The spelling of 21661465732391 in words is "twenty-one trillion, six hundred sixty-one billion, four hundred sixty-five million, seven hundred thirty-two thousand, three hundred ninety-one".