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31212221213 = 60443516391
BaseRepresentation
bin11101000100011001…
…001011001100011101
32222120020022010021002
4131010121023030131
51002410312034323
622201054120045
72153316334325
oct350431131435
988506263232
1031212221213
1112267537848
126070ab0025
132c35578164
14172143a285
15c2a27a828
hex74464b31d

31212221213 has 4 divisors (see below), whose sum is σ = 31212798048. Its totient is φ = 31211644380.

The previous prime is 31212221207. The next prime is 31212221237.

31212221213 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31212221213 - 212 = 31212217117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212221263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197753 + ... + 318638.

It is an arithmetic number, because the mean of its divisors is an integer number (7803199512).

Almost surely, 231212221213 is an apocalyptic number.

It is an amenable number.

31212221213 is a deficient number, since it is larger than the sum of its proper divisors (576835).

31212221213 is an equidigital number, since it uses as much as digits as its factorization.

31212221213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576834.

The product of its digits is 288, while the sum is 20.

The spelling of 31212221213 in words is "thirty-one billion, two hundred twelve million, two hundred twenty-one thousand, two hundred thirteen".

Divisors: 1 60443 516391 31212221213