Search a number
-
+
21956378290 = 2571128514777
BaseRepresentation
bin10100011100101100…
…111011111010110010
32002200011210120201221
4110130230323322302
5324431313101130
614030413215254
71405046064460
oct243454737262
962604716657
1021956378290
119347891a90
12430919152a
1320bbabab22
1410c4067830
158878b387a
hex51cb3beb2

21956378290 has 32 divisors (see below), whose sum is σ = 49273536384. Its totient is φ = 6843546240.

The previous prime is 21956378287. The next prime is 21956378293. The reversal of 21956378290 is 9287365912.

It is an interprime number because it is at equal distance from previous prime (21956378287) and next prime (21956378293).

It is a super-2 number, since 2×219563782902 (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21956378293) 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, 14256619 + ... + 14258158.

It is an arithmetic number, because the mean of its divisors is an integer number (1539798012).

Almost surely, 221956378290 is an apocalyptic number.

21956378290 is an abundant number, since it is smaller than the sum of its proper divisors (27317158094).

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

21956378290 is a wasteful number, since it uses less digits than its factorization.

21956378290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28514802.

The product of its (nonzero) digits is 1632960, while the sum is 52.

The spelling of 21956378290 in words is "twenty-one billion, nine hundred fifty-six million, three hundred seventy-eight thousand, two hundred ninety".

Divisors: 1 2 5 7 10 11 14 22 35 55 70 77 110 154 385 770 28514777 57029554 142573885 199603439 285147770 313662547 399206878 627325094 998017195 1568312735 1996034390 2195637829 3136625470 4391275658 10978189145 21956378290