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21123032011 = 47532384431
BaseRepresentation
bin10011101011000001…
…111110001111001011
32000112002201012112221
4103223001332033023
5321224444011021
613412003514511
71345306544464
oct235301761713
960462635487
1021123032011
118a5a445654
124116088a37
131cb8260b13
1410454dbd6b
15839651241
hex4eb07e3cb

21123032011 has 8 divisors (see below), whose sum is σ = 21576766464. Its totient is φ = 20669477160.

The previous prime is 21123031973. The next prime is 21123032017. The reversal of 21123032011 is 11023032112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21123032011 - 27 = 21123031883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21123032017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207966 + ... + 292396.

It is an arithmetic number, because the mean of its divisors is an integer number (2697095808).

Almost surely, 221123032011 is an apocalyptic number.

21123032011 is a deficient number, since it is larger than the sum of its proper divisors (453734453).

21123032011 is an equidigital number, since it uses as much as digits as its factorization.

21123032011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89801.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21123032011 its reverse (11023032112), we get a palindrome (32146064123).

The spelling of 21123032011 in words is "twenty-one billion, one hundred twenty-three million, thirty-two thousand, eleven".

Divisors: 1 47 5323 84431 250181 3968257 449426213 21123032011