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BaseRepresentation
bin1001110110011011100111…
…11110000110010100111010
32211200211000210100201020210
410323031303332012110322
510314400140211414120
6114023050122531550
74363663212516660
oct473156376062472
984624023321223
1021661465732410
1169a1637768a89
12251a179066bb6
13c1188a51b92a
1454c5c5d40c30
152786e76e8ce0
hex13b373f8653a

21661465732410 has 128 divisors (see below), whose sum is σ = 62370404352000. Its totient is φ = 4710264744960.

The previous prime is 21661465732391. The next prime is 21661465732429. The reversal of 21661465732410 is 1423756416612.

It is an interprime number because it is at equal distance from previous prime (21661465732391) and next prime (21661465732429).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21661465732410.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 27814335 + ... + 28582514.

It is an arithmetic number, because the mean of its divisors is an integer number (487268784000).

Almost surely, 221661465732410 is an apocalyptic number.

21661465732410 is an abundant number, since it is smaller than the sum of its proper divisors (40708938619590).

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

21661465732410 is a wasteful number, since it uses less digits than its factorization.

21661465732410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56396956.

The product of its (nonzero) digits is 1451520, while the sum is 48.

The spelling of 21661465732410 in words is "twenty-one trillion, six hundred sixty-one billion, four hundred sixty-five million, seven hundred thirty-two thousand, four hundred ten".