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42012320121 = 3217926078411
BaseRepresentation
bin100111001000001000…
…010010000101111001
311000102220120222202100
4213020020102011321
51142020123220441
631144501454013
73015050554212
oct471010220571
9130386528670
1042012320121
11168a994aa22
128185a11309
133c66c51525
142067952409
15115d4cecb6
hex9c8212179

42012320121 has 12 divisors (see below), whose sum is σ = 61023484080. Its totient is φ = 27851741880.

The previous prime is 42012320101. The next prime is 42012320153. The reversal of 42012320121 is 12102321024.

It is a happy number.

42012320121 is a `hidden beast` number, since 420 + 1 + 23 + 201 + 21 = 666.

It is not a de Polignac number, because 42012320121 - 223 = 42003931513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42012320094 and 42012320103.

It is not an unprimeable number, because it can be changed into a prime (42012320101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13037595 + ... + 13040816.

It is an arithmetic number, because the mean of its divisors is an integer number (5085290340).

Almost surely, 242012320121 is an apocalyptic number.

It is an amenable number.

42012320121 is a deficient number, since it is larger than the sum of its proper divisors (19011163959).

42012320121 is a wasteful number, since it uses less digits than its factorization.

42012320121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26078596 (or 26078593 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 42012320121 its reverse (12102321024), we get a palindrome (54114641145).

The spelling of 42012320121 in words is "forty-two billion, twelve million, three hundred twenty thousand, one hundred twenty-one".

Divisors: 1 3 9 179 537 1611 26078411 78235233 234705699 4668035569 14004106707 42012320121