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BaseRepresentation
bin1110001100011010110011…
…01000110001110100110111
311002111221021210220112011111
413012031121220301310313
513042343241441431403
6150215022451415451
76401032003443142
oct706153150616467
9132457253815144
1031213031202103
119a44410434163
123601364bb4587
1314554b7701b1a
1479ca0c443059
15391dc8a2b56d
hex1c6359a31d37

31213031202103 has 4 divisors (see below), whose sum is σ = 31213472652280. Its totient is φ = 31212589751928.

The previous prime is 31213031202061. The next prime is 31213031202149. The reversal of 31213031202103 is 30120213031213.

Adding to 31213031202103 its reverse (30120213031213), we get a palindrome (61333244233316).

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 31213031202103 - 233 = 31204441267511 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 (31213031202203) 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, 220619013 + ... + 220760446.

It is an arithmetic number, because the mean of its divisors is an integer number (7803368163070).

Almost surely, 231213031202103 is an apocalyptic number.

31213031202103 is a deficient number, since it is larger than the sum of its proper divisors (441450177).

31213031202103 is an equidigital number, since it uses as much as digits as its factorization.

31213031202103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441450176.

The product of its (nonzero) digits is 648, while the sum is 22.

The spelling of 31213031202103 in words is "thirty-one trillion, two hundred thirteen billion, thirty-one million, two hundred two thousand, one hundred three".

Divisors: 1 70717 441379459 31213031202103