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31321313212 = 22710111075429
BaseRepresentation
bin11101001010111001…
…010100111110111100
32222211211120120100111
4131022321110332330
51003121224010322
622215552235404
72156112524650
oct351271247674
988754516314
1031321313212
1112313079222
1260a153bb64
132c52053137
141731b16a60
15c34b29177
hex74ae54fbc

31321313212 has 24 divisors (see below), whose sum is σ = 63262856160. Its totient is φ = 13290513600.

The previous prime is 31321313209. The next prime is 31321313237. The reversal of 31321313212 is 21231312313.

It is a super-2 number, since 2×313213132122 (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5534887 + ... + 5540542.

It is an arithmetic number, because the mean of its divisors is an integer number (2635952340).

Almost surely, 231321313212 is an apocalyptic number.

It is an amenable number.

31321313212 is an abundant number, since it is smaller than the sum of its proper divisors (31941542948).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31321313212 is a wasteful number, since it uses less digits than its factorization.

31321313212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11075541 (or 11075539 counting only the distinct ones).

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

Adding to 31321313212 its reverse (21231312313), we get a palindrome (52552625525).

The spelling of 31321313212 in words is "thirty-one billion, three hundred twenty-one million, three hundred thirteen thousand, two hundred twelve".

Divisors: 1 2 4 7 14 28 101 202 404 707 1414 2828 11075429 22150858 44301716 77528003 155056006 310112012 1118618329 2237236658 4474473316 7830328303 15660656606 31321313212