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21232342231 = 22395212297
BaseRepresentation
bin10011110001100010…
…111101010011010111
32000210201101201222121
4103301202331103113
5321440434422411
613430510440411
71351104634252
oct236142752327
960721351877
1021232342231
119006115a81
124146803107
132004ab4219
141055c34099
15844044571
hex4f18bd4d7

21232342231 has 4 divisors (see below), whose sum is σ = 21327554752. Its totient is φ = 21137129712.

The previous prime is 21232342211. The next prime is 21232342249. The reversal of 21232342231 is 13224323212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21232342231 - 211 = 21232340183 is a prime.

It is a super-2 number, since 2×212323422312 (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21232342196 and 21232342205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232342211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47605926 + ... + 47606371.

It is an arithmetic number, because the mean of its divisors is an integer number (5331888688).

Almost surely, 221232342231 is an apocalyptic number.

21232342231 is a deficient number, since it is larger than the sum of its proper divisors (95212521).

21232342231 is an equidigital number, since it uses as much as digits as its factorization.

21232342231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95212520.

The product of its digits is 3456, while the sum is 25.

Adding to 21232342231 its reverse (13224323212), we get a palindrome (34456665443).

The spelling of 21232342231 in words is "twenty-one billion, two hundred thirty-two million, three hundred forty-two thousand, two hundred thirty-one".

Divisors: 1 223 95212297 21232342231