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21661465732412 = 2211492306039373
BaseRepresentation
bin1001110110011011100111…
…11110000110010100111100
32211200211000210100201020212
410323031303332012110330
510314400140211414122
6114023050122531552
74363663212516662
oct473156376062474
984624023321225
1021661465732412
1169a1637768a90
12251a179066bb8
13c1188a51b92c
1454c5c5d40c32
152786e76e8ce2
hex13b373f8653c

21661465732412 has 12 divisors (see below), whose sum is σ = 41353707307416. Its totient is φ = 9846120787440.

The previous prime is 21661465732391. The next prime is 21661465732429. The reversal of 21661465732412 is 21423756416612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 246153019643 + ... + 246153019730.

It is an arithmetic number, because the mean of its divisors is an integer number (3446142275618).

Almost surely, 221661465732412 is an apocalyptic number.

21661465732412 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21661465732412 is a deficient number, since it is larger than the sum of its proper divisors (19692241575004).

21661465732412 is a wasteful number, since it uses less digits than its factorization.

21661465732412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492306039388 (or 492306039386 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 50.

The spelling of 21661465732412 in words is "twenty-one trillion, six hundred sixty-one billion, four hundred sixty-five million, seven hundred thirty-two thousand, four hundred twelve".

Divisors: 1 2 4 11 22 44 492306039373 984612078746 1969224157492 5415366433103 10830732866206 21661465732412